I first tried them 4 seasons ago and have used no others since. I've only ever used saddles needing a 5/16 hole, but the DSD saddle wants the white washer flat side down for 5/16 and the other side down for bigger holes. On all new holes the 5/16 works great. DSD also makes a 5/16 mainline drill bit, short enough that it can not drill thru the back side, what a huge improvement. That bit is made for plastic and does not walk when you start to drill. That and a cordless drill are your best way to put a hold for new saddles. As others have said, don't over tighten the clamp. You also want to use size specific saddles, while a 1" will tighten down to a 3/4" mainline, the pressure for the seal is not direct on the gasket and it does not work as well as a 3/4" on 3/4", a 1" on 1" and so forth.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.