if you have some g-code of a typical part that you are looking to make i would take a trip over there and watch it in action... remember that you may be splashing a large amout of cash... you need to know if it will earn its keep (he is offering training so its sure he will acommodate you)

tool changer is a masive advantage :)

you really need to do some maths and pick a number that you can jusifiy (assuming it hits the spot on your 3D requirment and all is well with it) and go for glory

if you do go to have a look you may want to take a dti guage and check for backlash etc
might be worth posting a new thread asking for things to check for if you decide you are going over for a demo