Ive heard both
I lovem both too
The Eclipse is **** near perfect. It has the most amazing SQ of any sub, that plays that ****ing loud. The W7 just knocks me out. It has good SQ (not as good as ecplise) but its SPL is amazing. It doensnt seem as loud...but thats because it doesnt distort at all. Thoes of you who have subs that distort a lot (anyone who owns fosgate or MTX) will sit in a car wiht w7's and youll think its not as loud as it is, till the windsheild blows out, and you have a headache for a week. JL spent 6 + years on this sub, and its just awesome. It has amazing xmax, it has amazing power handeling (they connected 10000 watts to each voice coil, and it held up fine) It really doesnt distort at all. ITs a lot louder than you would think, just because, your not pickign up the 50hz ting that you do with a lot of subs.
You just have to experience them for a week or so, and you'll be hooked
The bottom line with them is, tune themand power them just right.
So
Eclipse = Killer SQ and **** good SPL
W7 = Very good SQ and **** myself SPL