There is nothing wrong with an R4 providing you buy the right one. People shouldn't automatically turn into sheep and label everything as awful because someone else has said so or as i've read for a long time on these forms "its fake" because someone told them it was or had one bad experience and labelled it so, so naturally it snowballs and that becomes the norm.
As i cited in another thread, i've used R4's R4i's and Acekard's and never had any issues because its from a reputable dealer and i've been bothered to look into it first and ask the right questions. R4's are still available they just stopped becoming the standard when the DSi was launched, but there are still a large portion of people that are on the old DS.
The R4i-SDHC is actually the original R4, and whilst the R4i SDHC Upgrade is a clone, ironically its made by the same manufacturer, its all the other R4 fake variations you need to watch and those that have simply used the name, the likes of the "golds" "hyper" "chrismas edition" etc that use a different chipset.
Unfortunately there are alot of REALLY bad clone/fake carts out there and you just need to be careful what you purchase. In any case, its not like there is copyright on carts is there
some people just know how to code correctly and/or use quality materials/chips rather than being sloppy and looking for a quick buck.
Personally i would recommend the original R4 for the DS, the "original" R4i (DSi) or the Acekard2i, and thats based on MY experience of them because i have all three.
Finally, Clone and Fake are two different things make sure thats understood.