I'm using a Truspot 6x with a #2 clarifier. No problem.
Perimeter is clear just like the center.
I don't use the truspot for indoor multiple spot faces like the Vegas or 5 spot NFAA. With the multiple spot faces you always see the edge of the other 2 spots (on Vegas) or the edge of the 4 spots (on the NFAA). It is annoying. Sort of like a kaleidescope effect.
For indoor I use the 4 power x-view by brite sight.
Just my $.02