Wallsend, you're quite right, BALPA has certainly improved T&Cs within PAS. The system is completely transparent and holds no surprises. Negotiations are ongoing but all opportunities are maximised I understand.
The additional benefits of BALPA membership are well known, a legal team with comprehensive experience in 'all matters aviation' is just one example. From a company perspective, the only downside is the fact that it takes 3 CC reps out of the roster for several days every year and that's not cheap!