This drum machine has great midi implementation and the digital features (auto variation, fills, pattern merging, kit saving, song mode, timbre selection, pattern colors,...) go very deep. Most sounds have several timbre options which makes this a very versatile piece of kit.
The build quality is acceptable. It's not a Moog and it doesn't have to be. Knobs feel good for tweaking and the switches are responsive. Led buttons are great.
The sounds are 90% there - while they do sound great, they are not completely the same as on the TR-606. The kick delay is a little more boomy and the hats have the 606 flavor for sure, but the Roland TR-06 is closer, sound wise.
This is a great analog drum machine with a lot of performance oriented features and it's a great alternative to the drumbrute impact, volca drum, and roland boutiques.