I own about three dozen assorted multitools (not including SAKs), including several Gerbers.
I hate them.
In general, they're big and heavy compared to Leatherman, Victorinox or SOG tools that offer similar functionality. Finish is invariably bead-blasted, making everything feel gritty and rough. Knife blades are thin and don't seem very sturdy, and won't hold an edge fer crap. Scissors are short and stubby, with that highly-curved Fiskars design that can't cut much thicker than paper reliably or comfortably. The slide-out models (400 and 600 series) are fitted loosely, and rattle when open and when closed.
On the plus side, every tool locks, except on the keychain-sized tools. Also, the plier design itself is sturdy; they take a beating and come back for more.
Then there's the issue of the parent company, which has transformed one of the great American knife and tool companies into an outfit that resells cheap Chinese knock-offs of *real* knives.