6% if you're YCombinator is one thing, there's track record, location, address book, mentors, who you get to pitch to, etc... and you can easily come to the conclusion that you've had value-for-equity.
But I read BGV's site carefully as I would consider my startup to be exactly what they are looking for, and I meet all of their requirements (we're even London based), but... I couldn't find on their site the value to my startup, and how the 6% translated into anything of substance to me.
If it's not the people (experienced, with contacts, track record, etc), then I'm looking at the money, and the money isn't enough to justify the equity given the weakness of the rest of the offering.
It feels like someone has tried to emulate YC without understand what the value of YC is.