Gordon: I had the use of using the Legacy with Speed brakes for a few hundred hours then one side went u/s for over a year and I flew without them until recently after I replaced a sensor.   Indeed, these are slippery little devils that require some planning in a pattern or before descent from altitude.   My overall feeling having flown both ways is that I would not incorporate them if given the choice before the build.   I would live with the speed "problem" and lack of drag and find ways to bleed off speed or start down earlier.   I found I used them mostly because I got behind the airplane but that's not a great reason.   Most helpful uses for me: 1) spiralling down 16,500 over Kalispell after passing the mountains, 2) killing lift on the runway after landing, 3) too high and hot on short final.  If you've got the build for them and find a pair I would put them in.  My switch is on the panel, I would put it on the stick if wiring it again.