Never fired a P95, but I did pick up a Sigma (SW9VE) used not that long ago.
The stories about the trigger are pretty much right on. While mine didn't have much grit and was very consistent, the pull was insanely heavy. I never gauged it, but I think it was somewhere in the 12-15 pound range. Aside from that, the gun is very reliable and fairly accurate.
I just installed the Apex spring kit for the Sigma, and it really did help. The pull is still on the slightly heavy side (6 pounds or so) but it is much more manageable.
With the spring kit, the Sigma is a decent choice for an inexpensive defensive pistol. Without the spring kit it is passable but difficult for many to shoot well.