Simon,
Completed ATPL ground school with AFT, averaged 94% with first time passes in all 14 subjects over 10 months whilst working full time.
Can't praise them enough, however like most I have no comparison as I only studied with the one provider!
However, good books, nice being able to do it in 3 modules instead of 2 so less difficulty getting the time off work etc. Excellent instruction and flexible with the brush ups. A fairly personal touch and for me conveniently located.
Regards,
Obs