I'm completing a MA in CompLit from KCL in a month - I've finished the courses & essays and am now writing my dissertation.
I absolutely loved the programme: the academic staff is great, the courses were very interesting and challenging, and I had the opportunity to specialise in a lot of different areas, read texts from many different traditions (and languages), and research both on subjects on which I already had some preparation from my BA, and others which I had never approached before.
At King's, for the MA, we had to take two core courses, and then we could choose among a range of optional courses from the Department - the CompLit options were all great, but another very good thing about the programme is that you're also allowed to choose a couple of options from other Humanities Department, like French, English, American Studies, Music, Classics, or Film Studies. So basically, the Department offers its own options (which are excellent, and allow you to work closely with their staff), but you can also pick other options you like from the whole School of Humanities.
Personally, I'm really enthusiastic about CompLit at KCL. I would recommend it to everyone who loves literature, and doesn't want to be limited to just one country-specific tradition.