nah the main problem with it is the longer delay
it makes it a lot less viable for ubers and in general for destroying buildings, which is what the demoman is supposed to do
14 stickies means nothing between reloading and whatever that takes forever
blowing up enemy stickies is also meaningless since you can blow them away with the regular ones to begin with
and demos arent even close to being overpowered
oh and vahn i have an nvidia gtx 275