Budget 30ish amp brushless controller

I'm looking for a controller for my mongoose cx conversion build.

I'll be using a Lightningrods small block motor and 14s5p 18650 battery.

Has anyone used one of these?

Black 36V/48V 1200W Brushless DC Sine Wave Ebike Controller 12MOSFET35A With Regenerative and Reverse Function For Electric Bike
http://s.aliexpress.com/IbIvU7Z3?fromSns=Copy to Clipboard

Any other recommendations would be great.
Thanks in advance