I have the drain kit from Skidim, installed it several years ago. They do clog once in a while. Once I got the feel for how much should drain out of them, I got comfortable leaving them in. I usually have to pull one of the four when I winterize. I had the old style clog up as well, so keep an eye on those too. I would probably get them again, but they are not maintenance free.
1989 ProStar 190 with "Safe T Top", 351 Ford, GT 40 heads painted Ford Blue, Elec. Ign, 1:1, 720 hours, 4 blade prop, PP 6.5, removable platform brackets, custom color from factory, hot water shower, Boat Buddy & LED lights on trailer
2010 D3 Z7, 2 @ 32 off, 34 mph so far