I dont know about this specific one, but from the looks of the hardware, and what I can see in the pics, it appears to be a pretty good quality built banjo. Brass brackets, J hooks & tailpiece are nice.
It looks a lot like my Gold Tone BUC banjolele. If it's like my Gold Tone then there is no need to remove the back. I think that if you look carefully at the pictures you'll notice that there is a gap of about 3/16" between the rear resonator and the sides. I tune the Gold Tone GCAE (low G). It's plenty loud!
It's a little more expensive, but obviously a much nicer instrument with a better quality build/finish etc. What do you reckon? I just see me buying the cheap one, it being OK but not great, and me still hankering after the Grafton, so then thats £140 wasted that could've gone towards the Grafton?...