All guns can have issues, but if you have an HW100 in perfect working order (most are) then it's a tough act to beat imo.

Never had issues with the two piece action, in fact the only issue i had was my .22 went a little low on power, a good de-grease and clean of some of the internals sorted it out straight away.
Imo, HC put too much grease in the mechanisms, the grease thickens in the cold, and slows the way they operate.

I chrono mine on a regular basis, and it's unbelievable how consistant the readings are.

Definately keepers!