Work levels are probably at or above EasyJet and close to Ryanair
BS on two counts. For one, EZY work harder than Ryanair. Two, LOTS of EZY and FR pilots are stampeding towards BA for a bit less starting money but far fewer hours. If your hours are 2000+ with 1000+ 737/A320 or equivalent you qualify for longhaul DEP (B777) which is like a holiday compared to the loco's.
Longhaul with low seniority gives you 4-6 trips per month, mostly 2-3 day Atlantics or Middle East with a bit of India thrown in. On line training you'll generally get a Caribbean trip and/or a hot'n'high (Africa) just to wet your appetite! You should get about 15 days off a month. Expect 10-15k net in allowances p.a.
Starting pay good (42k). Pensionable pay (about 33k) is worse than previous BA contracts but still way better than EZY or RYR.
If you can stand the RH seat for the next 8-18 years then its a no-brainer! Speaking as an over-30 I can say there is no question I made the right move.