I accidentally updated my dsi firmware to 1.44, so I'm unsure if the DSTwo will work on it; also, I don't know which site that sells the product is actually reliable. Any help would be nice, thanks.
Also, Realhotstuff seems a bit shady; two reviews on shoptemp mentioned that the site tried to take money from their credit cards, so are there any other sites?It would work with 1.4.4. As for reliable sites, head over to shoptemp.net and check out there. Realhotstuff is very reliable, and if you ask them they'll update your card to the latest firmware as well.
Which R4 is the current newest one that supports both 3ds or dsi pretty well?With R4s you have to be very, very careful when picking out the model, since there's possibly hundreds of clones with bad or no support.
Just go with the DSTwo. It's cheaper than a new game.
What about RTS/C?modchipcentral is a great site. A little more expensive though.
As for if its worth it or not, depends on if you want gba games and better super nes games. Otherwise, stick with ak or r4, even though ak hasnt been updated for 1.44 yey.