Pros: Works great with my NDS lite, and my R4 card. Once I got everything up and running I have had no problems. The rumble works incredibly well, and the RAM works with the browser!

Cons: No instructions, but with a quick search online it's pretty easy to figure out what to do. (GBA EXPloader)
Not quite flush fitting.
The rumble only works with a handful of games, and is VERY loud. (But powerful!)

Other Thoughts:

Bottomline: Great for the price, as long as you have a good grasp of what you're doing you'll have no problem getting it to work.

Pros: If you lost your white GBA Cover on your DS then this makes an excellent replacement than buying a new shell. It rumbles and has memory. Now I can use my opera browser without any hassels and surf the net. Saves me having to switch between a rumble pack and a memory expansion pack. A must have if you want to unlock you DS to its full capabilities.

Cons: Does not come with software. You have to really search high and low online for it. The battery life reduces slightly, especially when rumble mode. If the battery goes flat it cant be replaced without destroying it, because the battery is soldered to the board. When the battey is flat it will not retain its save games in GBA Mode. Not that I really care as I don't play GBA games. Doesn't fit 100% flush with the DS, it only sticks out by 1mm or so. No biggie.

Other Thoughts: There are 2 versions of this unit, one with 2 memory chips and version with 1 memory chip. The 3 in 1 unit that has 2 chips only works with EZ5_3in1.nds Ver 0.1 By Rudolph. When I have the time I'll do a movie to show how to replace the battery. They shoud make one that allows interchangable batteries. Not all DS games support rumble packs. Like I give too hoots. I don't know if it can rumble and use the expansion memory at the same time as my 3 in 1 menu allows for one option at a time. Would be nice if it came in different colours. Price could be allot better.

Bottomline: If you just want a rumble pack then just buy a rumble pack. They are way cheaper. If your going to get a memory expansion pack you might as well get this. Some DS Fash Carts have a separate rumble pack and memory expansion pack. I can't be bothered switching and this works out to be a better alternative.

Pros: Perfect, looks very good with my white NDS, got mine working with the slot1 DSTT (also white)for all 3 uses GBA games, Rumble and the browser, contradictory to the DSTT manufacturer's website. Also store as much data as you like. tested with a 16GB HCSD and works fine.

Cons: Very little cons I have found.
Fit: Mines not 100% flush with the DS, however it only sticks out by 1mm or so. Nothing major.

Other Thoughts: You need a slot 1 device to use this. Get this with the New TopToy DSTT Multimedia Card for less then $30.

Bottomline: Good value for money. Works very very well.

Pros: - Contains a rumble system.
- Contains RAM memory, which can be used for the DS browser or for GBA games.
- Contains NOR flash memory, which can be used for GBA games.
- Contains SRAM memory for GBA game saving
- No patching needed/patching on the fly
- Works perfectly together with Acekard2

Cons: No serious cons that I can think of. But:
- reduces battery life slightly, especially when rumbling
- only a few DS games support a rumble pack
- Only available in black or white. If your DS Lite has a different color, you could transfer the contents to the slot 2 dummy that came with your Lite.

Other Thoughts: The cooperation with the Acekard2 with the newest software (Bliss merged) is absolutely fabulous. You don't have to think of anything, just put NDS and GBA games on your TF card, click it and play it.
They could've left out the rumbling and noone would miss it.
GBA games stored in RAM will vanish when you power down. GBA games stored in NOR flash will behave like a genuine GBA cartridge, staying alife even after power down and cartridge removal. Theoretically, you could even insert the cartridge in a real GBA (except that it wouldn't fit) and it would boot.

Bottomline: If you like your old GBA games, this is an absolute must-have.
If you want to use the DS browser, this is an absolute must-have.
Otherwise, skip it. The rumble really isn't worth it and there are other, much cheaper rumble-only packs.
The price can't be beaten for what it offers.