I am a full time kitchen fitter and used to use top name bits but quite honestly these do the job just as well for a quarter of the cost. Do yourself a favour.
Black Wall Mount Universal Surround Small Speaker Brackets Swivel & Tilt 2 Pack
Good piece of kit but a bit fiddly to go from a straight cut to angled, on a gable when you're constantly cutting opposing angles it is a fiddle. Still better than cutting with a circular saw, no dust which is great. On the whole it is worth the money.