Its cheaper than a pack of cigarette (I don't smoke but this is my excuse for buying cubes when the spouse nags...) lol
btw - my ofna 50k just landed. am thinking of swapping lingyun core for c4u (add washers?), clean out my tamiya 30k, and re-lube with 50k...
Currently, the lingyun is behaving well (using it as a training tool - accurate and slow turning)
edit: swapped the core. screws, washers and spring=dayan. Now cube is better than before, at looser tension. No pops yet. Cut corners slighter. ofna is good too.