Tomer I have speed bleeders on my 86 GTV6 and they work very well.The only point of caution is the driver side rear caliper.One of the two bleeders (I can't remember if it's the inside or outside) may be too close to your exhaust pipe as the speed bleeders are longer than stock.In my case I returned to stock for this one to avoid contact with the pipe.
1986-GTV6
1989-75 Twinspark very sadly sold-remarkable sedan !
2014 Audi Q5 3.0l TDI - torque MONSTER
They do work really well but I'm not sure how long they last. The first few times I've used mine they worked perfect. The last time I used them they did let some air back in however.