I've only used it for cutting in the past. I try to only use it on occasion b/ I know its harsh on your system. Anyways, what I'm planning on doing in the near future is 150 mg tren eod, 600mg/wk prop, and 4 iu/day GH. I was going to run the tren and test 10 solid wks. My friend tells me to use something else besides tren b/ he feels it will be too harsh on my body, but I try to limit my tren cycles to 1x/yr max anyways so I think I'll give it a go. So as for a lean bulk, do you guys like tren?