did not try letro myself, but always read, that it is the strongest ai available, so there should be no gyno probs even with strong aromatising cycles, it even helps a bit against progesterone sides as far as i know. unfortunately it only blocks the aromatase enzyme, so you have to deal with the rebound.
would it be beneficial to use aromasin in pct (along with serms) if sb used letro on cycle ? to eliminate estrogen and speed recovery, bc aromasin = suicide inhibitor = 0 rebound ?
i only used aromasin before with moderate test cycles and never had a problem with sides. also always recovered very well, absolutely no crash (hcg and aromasin on cycle, nolva clomid pct). but i havent used nandrolones yet.