I jusr finished my 8-week cycle of sust with dbol as a kicker for the first 3 weeks. It takes over 2 weeks for me to begin to feel anything from sust, so the dbol fills in a nice niche in the beginning to give me solid strength gains and size. When I got off the dbol, the sust kicked in right away, and I did not lose almost any weight (though I was using Arimidex, so I wasn't carrying a lot of water to begin with). I use 30mg/day, spread out over the day.
The only problem is that by the third week, dbol was causing such huge pumps in my lower back, I almost couldn't squat or bend over. That went away after I dropped the dbol going into week 4.