I have Burstbuckers in my geckoburst lp........really great pups. I agree with the overall opinion that they have a open, airy tone. My LP has replaced my Explorer as my main guitar because of this. I have '57's in my SG standard. The 57's are great as well, very "classic", even tone for each string, and I have noticed a really great low end response with these pups.
I'm not really understanding the lack of love some of you guys are expressing for the 500's. I have 2 Explorers, and 1 V with these pups and they sound great. I have also put these pups in a few guitars that I have bought over the years as replacements.....they never fail me.
I also play in a complex, psychedelic band; and ALL we use are complex chords, and I have never had an issue with clarity with these pups going through my Marshalls......but I do agree that 57's, or burstbuckers will open the Explorer up to new tonal possibilities.
Keep us informed when you make your choice, and do the switch.