Hi tom, i got a crawler set in my lp for like a month now and regarding your second question i can tell you that their split sound are really good especially for clean acoustic-like cleans and for 'soiled-cleans' (that's how i use them

, the hums are better for heavier distortion levels). I also got a strat to compare to and the splitted crawlers quite remind me of it, but without really sounding anything like it :? .... there's just this aftertaste... that is not cr@p let me reassure you
the splitted neck is the most fender-ish, the tone gets seriously thinner and quackier but since it's in a all mahogany guitar, it doesn't have this acid fenderish quality a strat neck pup has...more neutral :| ... but still it sounds very good, very musical, and very useable... yeah it also cleans up really nicely...
The splitted neck and bridge in series are also quite awesome. Again not as quacky as a strat in-between position but you can still play funky staccato rythm parts and sound authentic :D even with a lp which is something weird to hear and see at the same time. In this position the tone also gets twangy enough for country bits.
The splitted bridge pup somehow retains the humbucker character, it's still kinda mids-focused but with less thickness and it's a tad brighter, but do not expect it to turn into a Tele bridge pup (not in a lp anyway). It's a also still quite powerfull but cleans up really well, i find it perfect for 'soiled-cleans' that even at 3 on my volume knob conserve loads of clarity and brightness...awesome.
Anyway hope that helps.