Flew ORD-LHR-BOM, and return in June '01, in F.
Actually, one of the better F trips I recall. Service was excellent; an extremely attentive staff. Nice sleeper seat.
Haven't done LH's F yet, but have heard from reliable source (father) that it was OK. He liked BA more.
IMHO, compared to the other non-F cabins (KL and NW's WBC), the 125K for BA's F is worthwhile.
If you go by BA, make sure to access the Molton Brown Spa in Departures Lounge at Terminal 4, in LHR. Quite a way to spend the few hours in LHR.