I picked C as the best and A as the worst. Differences were slight and it took some effort to see them. In day to day use I really don't think it would matter.
I would go with it over concrete just for the comfort factor. If your floor is not relatively level to start installation could be a pain. My floor was way out of level, so I used 2X4 sleepers and 3/4" plywood under carpet. Makes for a floor that does not feel like a basement floor.
I just typed a long winded respose but I lost it because I had a link to another sight. :frowning: In short Dan I have those lights and they are nice. Better too much light that is dimmable than not enough.
Roy, you can "program" a Harmony remote with the lutron codes from the Harmony website. No need for the spacer remote in this case. There are actually more codes than seem to be applicable to the spacer system remote so you might have to delete some and reassign some buttons. Works well though...