Air 2000 are OK, like most companies it has its weaknesses. Its best if you are out of the main bases, that is LGW and MAN if you want to avoid politics etc.
Bases would be LGW, STN, BHX and we are currently also doing W patterns through LUT, don't know if it'll ever be a base though.
Air 2000 is I believe the biggest charter company at LGW, I don't think you'd have a problem getting based there.
Average days off per month I would say is 9.
Unfortunately, even when they don't need you, they would rather put you on standby (even when there are no flights from your base that day/time) than give you a day off.
In fact they often roster a number of you on the same standby "just in case".
They are days at home, but not free from duty as there is the theoretical possibility of being called out. In summer, probably around 3-4 standbys per month, in winter depends on your base and fleet. If you are on the Boeing there are lots of winter contracts and so its a different kettle of fish, if you are on the Airbus nothing happens in winter so you'll have most of the week at home.
There is a very strong military feel/ attitude within the company, that is its main minus point. If you ever read the article about Korean Air a couple of years back, who used exclusively ex-military pilots until they realised what a mistake it was, then you'll know what I am talking about. It is starting to filter down a bit now, with pilots being taken on from a range of backgrounds/ hours, which is great.
Other than that, the usual one sidedness and lack of management negotiation when it comes to anything that might benefit the pilot (and possibly reduce the director's bonuses).
I reckon its no better or worse than most other airlines of its size.