I feel the same way about my Sig 50, 100 and 150. I may never NEED another mod but good luck letting that stop me. I even got the Sig 75 with TC on preorder.
The one thing I have noticed about Sigelei mods is they seem to have more power than others that I have such the IVP3, T8, SXmini, and even the God Mod and Kamry 200. IMO I think it's because Sigs have a higher amp output than most.
As crazy as it sounds my favorite thing about the Sig is that dumb silicon sleeve it comes with. Lol