I really like it. You kinda need long arms though. Without em it really likes to bind up and you get kinda of hefty body roll, I've seen grands with long arms and arb's lock up the rear and get none of the affects I'm talking about. Also, again with short arms, it likes to wheelie if you're aired up. When aired down it makes noise, cool squaking. Unless you have manual hubs a spool in the front is a very very very very bad idea, even then if you have an atlas or 2wlow you lose it's advantages if you spool the front. I think detroit with a 2wheel low in the front is the way to go.
Honestly, I love the spool though, wouldn't trade it for anything. I like it in the snow, I like it in the rain or dry I like the price. It kicks ass off road. I had a detroit in the rear when I had my 35c and it would lock sometimes, unlock, it was spooled sometimes not others it was being stupid, but everyone has tales of the fickle grace of the detroit, I like the predictability of the spool. I would definetly recomend it to someone who KNOWS what they're getting into at the same time though. Because the spool is definetly more rough than an arb or even most lunchbox lockers, it's not walk in the park, but it's sweet. And oh yeah, when I installed my lock right in the front I messed up and it spooled...it broke the steering box off in a parking lot. Good luck with whatever you decide to do though.
-Nate
damn I typed a lot, most is useless...cliff notes...spool is good!