Bluebirds are great servos... While I haven't had experience with the BL ones, the other few that I've used work great for about a year, then start to have issues(I beat on them HARD).



I use the BB 617 servo overvolted to 8.4v, they survive fine as long as your endpoints are set close, are fast, and torquy for a $25 servo that I replace every year...