I know a couple of guys up here that own the 150 for imaging, although I've also had a peek visually. Very sharp and noticeably more light throughput than my Esprit 100. I've never looked through a competing 150mm apo so have no frame of reference, but if you're up this way get in touch and I'll hook you up with the one of the owners.
As Adrian says, and speaking from experience having carried one
it's not a small or light scope, weighs about the same as a C11...