I've seen some demonstrators using these on YouTube; They are mostly black cubes with only focal colored pieces used to practice certain cases.
What do you call this? A test cube? A practice cube?
Would one just make one from two cubes and removing stickers from one, and swapping the pieces...
I am interested in buying a new cube to replace my ghost hand. Here's my priority list from most important features to least important:
moves very very very fast
no lock ups
durable
durable stickers (I am thinking of maybe going stickerless)
lightweight
non-DIY ( unless a DIY is that...