I've just finished a taught MA with Birkbeck and the experience was great! The courses were challenging, most of the lecturers were top class, and overall it was a brilliant two years.
I studied part time as I work full time and I found the College to be very understanding of the stresses and strains of people in my situation.
The library is quite good and the access to online resources was a huge bonus as I couldn't always visit in person. That the library was being refurbished during my time will help future scholars but I found the closure of summer 2007 inconvenient as my dissertation was due in September. Luckily Birkbeck's location encourages use of other local resources.
I would recommend evening study to anyone. It has changed my life for the good and I'm sure it will be beneficial to others.