Well it depends on what freewheel you want to get because if you run a freewheel that is designed to go on the front it will undo if it is put on the rear and vise-versa.
Well this http://www.hopetech.com/Reviews/mbr%20tech...%20nov%2008.pdf say that it is better then a mono mini and i ran a mono mini and it was awesome! So go for it.
Not bad at all, im amazed you can just about kick hop after only two week; took me long then that! Keep it up and get your own bike then you will get better much faster.