Pros: Same size as a DS game
SDHC compatible up to 8GB (I tested 4GB, works great)
White, looks good with a black DS lite.
Plays games at full speed.
Super fast loading time, I can get start playing a game within 10 seconds, including choosing.
Super cheap
Okay build quality, it does come apart, but I always keep it in my DS, no need for any other game!!!!
YOU WILL NEVER BUY ANOTHER DS GAME EVER! EVER!
I have tested 100% compatibility with games, and most homebrew.

Cons: Cheap build quality, but you get what you pay for.
None really, except the user interface is a bit scary (you have to install it on your microSD card before you can load games.
Not for the beginner.

Other Thoughts: GREAT!

Bottomline: Get it. NOW.

Pros: Works great.
Played all .nds games we tried (over 30).
Simple to use, just download the firmward, copy it on along with some game backups and everything worked.
Look at the price of this thing!
Cheat system works great and my son loves it.
With Moonshell software added (free) my son plays MP3's on his NDS now.
The included memory card readers worked perfect there we two included (TF->USB and TF->SD).

Cons: A little trouble getting the card recognized in my Mac, but reformatted the card with Fat-32 and worked great.
Build quality is ok but does seem a little fragile.
The UI on the DSTT software is rotten, it shows hidden files the Mac puts on and doesn't sort the files.
Also game files in sub-directories appear all together as one long list. So if you organize into folder it doesn't really work as the DSTT software still merges them all together.
Save files are put in the root of the card not in any sub-folders.
1mb sav files are not directly supported, some of the newer games use this larger size sav file and you have to let it create the sav then use a Windows utility to convert the sav file to a 1mb file.
We had a number of games seem to not work, then copied them on a second time (deleteing the sav files) and they worked. We haven't found a game yet that we couldn't get to work after a second copy.

Other Thoughts: Great value!

Bottomline: For the price it's unbeatable. If you can operate a bittorrent client you won't have any trouble finding material for this card and getting it working.

Pros: It's very easy to use, even first-timers won't have a hard time using it. Just download games, plug the microSD memory card using the adapter or the usb card reader, then copy and paste or drag and drop the games to the root folder of the OEM memory card.

Cons: some games can't be copied to the memory card but i guess the problem is on my side.
the sticker of the flashcart is kind of crooked which gives you an impression that it is PROBABLY fake.

Other Thoughts:

Bottomline: if you do not want to spend $35+ on a game, you should buy this! it includes all the things you will need. it's only twelve bucks.

Pros: Great price for the card and get a 2gig MicroSD with the bundle. Runs games perfectly fine with easy drag and drop to load them on the card with your computer. Build quality is sturdy enough (compared to other ones I have used).

Cons: MicroSD to SD card adapter doesn't work but that is ok since it comes with the USB adapter. Having glitches with the card here and there though; despite all games work at one point or another, sometimes it crashes (at a threshold of the memory card? I think that's why) and can get picky on what it would like to boot. Although sometimes plugging back the microSD back into the computer and taking it out again and reinserting into the card, sometimes it fixes the issue. This is the only serious con I have to say about this card.

Other Thoughts:

Bottomline: Cheap and it's what you pay for. Despite real NDS games do crash once in a while, there's ways to make this crash frequently if you don't 'take care' of it.