Hey James.
I have the Crawler a swampash/maple neck/ebony fretboard MXG customstrat (a brand Patrick Eggle made some years for a guitarshop in Holland). It's a quite versatile pickup for a lot of rockstyles, but I don't play prog. The Crawler really growls when pushed. Very fat and throaty (solo)tones, also above the 12th fret. The highs stay round, but are not dull and I can dial in enough treble for a balanced sound (I play a Rockerverb 50 that has no icepicky highs)
The Crawler might handle progressive styles when your amp/speakercombo has enought lowend tightness. I mention this bec the Crawler might have a tad too soft bass-response for prog. and metal. Overall the flavour is quite PAF-ish, but thicker, with more balls and output. It's like a Mule on steriods.
Bottomline: not really a genuine metal/prog-pickup, the Crawler is more hardrock then metal. Personally I think the Holy Diver is closer to what you're looking for.
Hope this helps a bit
Frank