Hello,
I have never physically touched a 4x4 in my life, that is how little experience I have with 4x4's. I just skipped straight to the 5x5 and I have decided to backtrack and get a 4x4. I've heard of some cubes that are good by the following brands:
1. Maru 4x4
2. YJ 4x4
3. QJ 4x4
4...