i don't use stickers, but i'm not here to tell others not to.
Any player that cares will know what tension their racket
USED TO BE until it came off the machine (according the stringer, yada yada).
good point on where NOT to put them though.
Microgel Radical MP (5), Cheap 16g Gut/ RedDevil 1.19 - 56/54# (among other setups)