The body shell is plastic, this makes it cheaper to produce and also easier to clean. The main workings are Alu. I don't see how it's a bas thing that they have plastic body shells. If you want to pay £1000 for a marker just because it has custom milling then go for it.
The stock trigger isn't 'that' bad, but for £20 you can buy a CP trigger which is just as good as any other metal trigger ?
The ION
IS open bolt, the bolt is in the open position when it's 'at rest'.
Surly that shows that they are good value for money ?