Bought this to use with my Ableton Push 3 (Standalone), so I can roll it around the house and studio room and record and jam anywhere easily. Fits well, sturdy and stable enough in use, even for finger drumming, and the adjustable angle is great.
The only two things I'd love to change would be:
1) Having the side brackets that hold the device in place a bit lower - they don't get in the way in use, but it's a bit tricky to use a Decksaver to protect the device, as then you can't adjust the sides very snugly
2) Ability to adjust the height even lower: it's almost perfect, but for cosy sofa jams it'd be nice to have one or two lower positions available.
Otherwise top marks from me, those are minor nitpicks for a very good product.