I just received the StarTech USB3S2SAT3CB adapter today (Dec 14th 2018) and I am currently transferring my Wii games to the 2.5" Hitachi 250GB HDD which is rated at 700mA power draw and the device shows up in Windows 10 1809 (build 17763) as 'ASMT1051'.
I noticed when I first plugged it into the Windows 10 PC, after formatting the Hitachi 2.5" HDD to FAT32 through GParted in Linux Mint on a old laptop (my backup computer), that it was only getting 25MB/s on a USB 3.0 port which is USB 2 speed when trasnferring about 6.5GB of data to it.
but after unplugging it and plugging it back in... USB 3 speeds were obtained as I floated around 56MB/s (this seemed to be about the drives top speed) although it slowed a bit towards the end of the transfer down the low-to-mid 40's but it has about 154GB of data on it so the speeds I see are normal/expected for this Hitachi 250GB 2.5" HDD and it's using the USB 3 speed which saves time trasnferring games from the PC to the HDD for use on the Wii even though won't benefit the Wii itself since it's only a USB 2 connection.
NOTE: I got the StarTech device connected to a Vantec UGT-PC345 PCI-E card which is how I get USB 3 speeds as my computers motherboard itself only has USB 2.
NOTE: formatting the Hitachi 250GB 2.5" hard drive using GParted automatically gave me the 32k cluster size that people seem to recommend for Wii usage as I checked the drive using the 'chkdsk X:' (where "X" is the letter of your StarTech device) command in Windows 10 and it showed 32k cluster size.
as for the StarTech device itself... it seems well made as it does not feel cheap as the cable is thick and feels sturdy and has a tiny flashing red LED light on it while I am transferring data to it as a type this message and the cable is fairly short (about 18" or so depending on how one measures) which I consider a bonus for Wii usage. the StarTech device has a 2 year warranty. but I suggest ordering it through Newegg.com for those of us in the USA instead of Amazon as I am almost positive you will receive the item faster given my experience with Newegg over the years as it took 9 days to get it from Amazon where as with Newegg I would have likely received it AT LEAST 3 days ago (i.e. 6 days TOPS) as I tend to view, as a general rule, when ordering something from a reputable website that the item should be in your hand no later than 7 days MAX from the time you order it as with Newegg I would likely have had it Monday or Tuesday TOPS (i.e. 5-6 days) instead of today which is Friday as I ordered it from Amazon early Wednesday last week on Dec 5th and it just arrived today Dec 14th. but at the end of the day... I guess as long as this device stays reliable I can't complain much
but anyways onto the important information, I tested it on the Wii and... after plugging it into the Wii (in bottom USB port like usual) and powering on the Wii it goes straight to USBLoaderGX r1268 and it recognized the Hitachi 2.5" 250GB HDD drive which has a 700mA power draw. after briefly testing it on a Wii game for 10min or so it seems okay but I plan on more thoroughly testing it soon and will edit this post to update it with any new info I find.
either way, ill edit this post to confirm if everything seems okay after playing Scarface (Wii game) for some hours as that should be more of a proper test.
EDIT: bottom line... after playing the Scarface Wii game for at least a solid hour I have no issues. so I can now confirm this device works on my Wii.
so basically those who want a cheap way to connect a 2.5" hard drive to the Wii, this adapter is probably your best option since it's only $10-12 where as if you get those other 'Enclosure' types they will generally cost more and might be a bit more risk for issues turning up with the USB cable connection to the Enclosure where as this device seems less likely to have issues like that because it's all one solid unit.
IMPORTANT NOTE: based on the official specs for this StarTech adapter it says, "Max power of the attached drive is 900 mA" ; but keep in mind I have only tested hard drives with 700mA power draw (or less) on the Wii. but I guess either way, even if the Wii itself could output enough power from it's USB port to power a device of say 1 amp(1000mA) etc, the StarTech device itself will likely have problems on 2.5" hard drives that draw more than 900mA of power. but I can't imagine this would be a problem for most people since I can't imagine there are too many 2.5" hard drives that draw more than 900mA. either way, make SURE to check the power requirements of your 2.5" hard drive before buying for use on this adapter! NOTE: if you see something on a hard drive that says 0.55a that means 550mA (or 0.8a would mean 800mA etc) as I noticed looking around online a moment ago that some 2.5" hard drives I found exceed the 900mA StarTech device power draw limit, but the majority are fine. I don't see someone having trouble finding a 2.5" hard drive that will work with this device.