There isn't much one can say about the Roland AIRA TR-8 that isn't obvious. Recreating the 808 and 909 in one unit should have a pricetag three times what they charge for the TR-8. I got the 7x7 expansion pack, which adds the sounds of the Roland 707 and 727, as well as expands upon the 808 nand 909 stock sounds with a few more sounds that were only accessible via modded 808's and 909's before now. NOT getting the 7x7 expansion is a crime, as it doubles the sounds of the unit instantly. And if you don't know, you do not have to sequence usng only the 808 sounds or 727 sounds. Yopu can have the 808 kick, the 707 snare, claps from the 909, the Hi-Tom can be from the 727, and so on- all in one sequence. This leads to exponentially more possibilities with this iconic machine. Integrating the TR-8 with the TB-3, or the MX-1 Performance mixer, or into Ableton Live with aqny combination of the above just brings the TR-8 (yet again) to another level of production / Live play capability. The TR-8 is also EASY to learn. It truely is intuative and can be learned in about ten minutes by watching videos on YouTube either by Roland, or by any of the hundreds of others who have flocked to the internet to post "How I Play" type lessons. This is one of the most fun pieces of gear I have ever touched. Adding more pieces of the AIRA line only makes it better. If you're on the fence about getting a TR-8 vs. ANY other similarly priced piece of gear, get to the TR-8 side of that fence immediately. You won't be sorry.