I have a Vector AK-47 Underfolder with the black polymer furniture as my truck-gun. I absolutely love it.
The only possible thing that I wish it has was a side-scope rail, but I don't think those will work on any underfolder.
On a side note...
All underfolding stocks have some play in them. My underfolder has a small bit of play, and I understand that it can (and will) get worse with use. It takes some extensive gunsmithing to correct it, but it can be done to correct it.
My appologies if I highhjacked at all, but thought it may be something to consider since Vector sells underfolders. There may be a better folding design for some folks (but nothing looks quite as nice as underfolding.)
John