I used BGS back in 2003 whilst working full time.
Great books and material.
I can say I would use them again and strongly recommend them.
The instructors at the time were top blokes and made the brush up weeks fun.
I can only remember 4 of them. Baz with his 6 foot height CRP thing that looked like a drip feed stand, a guy who use to fly for Cathey Pacific who loved his Airbus tray, and a South African guy who I forget his name. There was another guy but I can't remember his name. And of course the god of ATPL, Alex.
The girls in the office also top.