I went from running a 9xl on 5s in my LSP (geared 15/46) to running a 1515 1y (2200kv) on 4s (geared 12-14/46). The power was great from the 9xl, I just felt the need to upgrade to a better motor. (plus the front endball fell off, it was the 540c version) The best way I can explain the difference is like: "Wow, the 9xl on 5s has great power!:018: " to "There's more power?!?!? How!?!?!:confused::032: " You think it's going to lose torque once you get near top speed, but no! It just keeps pulling, like: "Go!Go!Go!Go!Go!Go!Go!Go!Go!Go!Go!Go!!!!!!!!!!!!!!! !!!!:mad:1 :mad:1 "
Here is my thread where I decided between the 1515 and 1512
http://www.rc-monster.com/forum/showthread.php?t=5558
Hope this helps!
Bye:018: