I have a Sphere 2007 and X11 5.5 in my BJ4 and like Neil it's the best thing I've bought in a while
The feel is
different to a brushed setup, but after getting used to it I much prefer it, you have a lot more torque low down if you need it and the acceleration is very consistent at any speed. The brakes arn't as good as a brushed motor IMO, they're strong alright but seem a bit on or off.
The best bit is the almost complete lack of maintinence needed, I bolted it all into my BJ4 back in January and tonight was the first time it'd come out of the car, and thats only because I'm giving the car a rebuild before Kiddy