You can still find the predecessor, the EC4GT, on discount at some retail sites (like Illumn). I had picked up the EC4GT because it was such a good price for stated specs. Like the EC4GTS, it only takes protected cells. But the build quality is just as excellent and performance is still decent..

Spec EC4GT EC4GTS
Max 1000 (2h) 1800 (1h)
High 420 (4h45m) 800 (3h15m)
Med 200 (10h) 240 (12h)
Low 50 (25h) 50 (58h)
Ultra 1 (380h) 1 (380h)

The low figure is a little strange, considering how close is the medium duration. But clearly the CREE XHP35 HD is more efficient and brighter than the older CREE XP-L HI V3.