Chris, if you are referring to the slec fuselage jig, it is ok -ish; all you get is a load of plastic clamps + screws and a piece of printed sticky plastic.
You supply the 18mm melamine chipboard and you drill all the holes for the clamp screws.
It has it's uses in stopping the fuselage going banana shaped but the clamps themselves are quite flimsy and require additional clamps to keep things square. I'd give it 5/10
A few other random musings:
For building boards I use a an old door laid across a couple of old kitchen units and cover that with a sheet of plaster board; flat, takes pins well and is cheap to replace when you knacker it.
A bench hook and mitre box will come in handy.
If you buy a dremel makes sure you get decent eye protection and USE IT EVERY TIME you're grinding or cutting.
Cyano fumes can give you flu like symptoms and some people suffer worse than others Epoxy can cause skin problems and it's effects can be cumulative. Balsa dust is bad, carbon dust is probably worse - work outside if you can when sanding.
Collect tin lids and lolly sticks for mixing epoxy, curry trays for bits, jam jars for brushes - I never seem to have enough.
Plastic A4 wallets, when cut open, can make good plan protectors
Lego or Duplo bricks make good jigs for keeping wing ribs square.
Definitely +1 for the razor plane – you wont believe how therapeutic using one is.
A Stanley knife is useful for accurate cutting of ply up to about an 1/8th inch ( lots of light cuts)
If you are film covering, the rotary cutting tools used for dressmaking are easier to use than scissors.