AFAIK, not too many people on TB have heard this thing in action yet... but there's been plenty of discussion, and a demo video floating around for a while. Just search for "MXR Grande" ("El" might be too short for the search feature).
But I didn't realize MXR had finally posted their own samples of the El Grande Bass Fuzz on their website... it sounds great, IMO. Better than in that demo video!
http://www.jimdunlop.com/index.php?p...p_and_e_detail