I dont necessarily think slin by itself makes the world of a difference. I think that its NOT worth using unless with either a clean bulking diet and AAS, or the former listed and GH.
Slin and GH TOGETHER are capable of shuttling the entire amino acid spectrum into the muscle. Not one or the other.
me and a bro from anabolicminds.com both tested igf-1 with slin and found that the synergy experienced with slin and gh was not there.....
so if the STRATEGY of using slin is correct, the yes it is very powerful.. .otherwise I think you are just playing with fire..