I agree totally with
Craig on this. Basically Boost 11 crunches (distorts) anything going through it.
(If you cannot hear it you have a problem!!) So for pristine final mixes it is definitely not the go. If you use it on a final mix you are severely compromising it. If you are really serious about keeping your final mix totally pristine this is not the way to do it. I tried it once and heard it immediately and never used it again.
On tracks maybe but it does add crunch and to be perfectly honest it is not nice crunch either. (IMO)
PSP Xenon, now there is a limiter! Totally opposite to Boost 11. Could be said it is one of the best limiters on the planet. At a cost though. If you are really serious about maintaining mix integrity this is the only way to go.
This one is free:
http://vladgsound.wordpress.com/plugins/limiter6/ It might have a bit of a learning curve but I suspect it is way better sounding than Boost 11.