I have owned the Blue Ofna bump box for over a year now. I was worried I paid too much when I bought it for $50 with two new Dynamite 3300nimh packs. Best investment I have made for a starter!!!! I have had no issues with it. I use it for both my buggy and my truggy.
I have also used the red rtr losi box.......its ok. The Ofna has spoiled me.