I like the Pearce (Plus Zero) and grip plug on my 36. I bought a mag with (Plus One) today an learned that it's not compatible when a grip plug is in place. The (Plus One) extension has its own plug integrated. Luckily the local gun shop guy was cool and let me exchange it for a normal magazine.
“The worst thing that can happen to a good cause is, not to be skillfully attacked, but to be ineptly defended.”
- Claude Frédéric Bastiat