I use the Thomastik Blues Sliders on my Strat. They make great strings! Speaking of finished vs infinished, my upright came with a finished neck. Yuck! Finished necks are fine for Fretted instruments, but I literally got a blister from the upright! A little sand paper fixed it. Someone had taken the finish off of my Strat before I bought it, an I really like it.
I also have some finished wood yoyos that I like, but like how unfinished feels better.