I've shot both and think they are both great guns. The Ego is a fashion accessory while the proto is a cold hard killing machine
Yes the proto needs a clamping feedneck but most people have asa on/offs so no biggy there and a millenium chip is only a tenner. The difference you save in cash just buys you an ultralight frame and some training days. For the cost there is no better marker than the proto be it 05 or 06.
As for tech support, who needs online manuals when the proto booklet is one of the most comprehensive i have ever seen. Plus it's one of the simplest designs i have used. Only two things ever go wrong. And they are down to the battery or needing new o rings.
If you do manage to brutalise it then the boys at dye or heaven paintball are as good as they get.