Just a little off topic here, but I wanted to give thanks for this thread. My son-in-law is refinishing his kitchen cabinets. The doors have some grooves in them that he was really struggling with and in fact even though the kitchen is all tore up with the doors off everything he still was avoiding the sanding.
I read this thread and looked at the sanding mop site posted here and emailed him the info, telling him this might work good on his cabinet doors. Well he went to Harbor Freight and bought some real cheapies but they worked great, got the grooves done in one days worth of work. So THANKS for this thread and the info it provided. And, I'm going to order myself a real sanding mop.