Admittedly, if you're a F/O on an austrian contract, the salary is not very high. But the money is net, taxes and everything paid, 14 salaries p.y. with fairly decent austrian social benefits (medical, retirement etc...).
But for a G550 captain, the deal is on par with other european operators, much better than IJM for instance. The G550 (and C750/DA2000/Legacy also) operates with 4 pilots (2 Capt./2 F/O) on a 18/12 roster. You can plan on an average of 14-15 days at home each month. You live wherever you want in Europe and position on your first duty day and stay with the a/c for about 2 weeks, then back home.