Holland Park sixth form?

I got accepted a while back and was really happy about it, but I was also accepted into harris westminster which is my first choice right now. But with all this saturday school thing plus kinda long days, I'm still thinking about my other options. What do you think about hpsf? Anyone a past student? Whats it like for a external student? What also really catches my attention are the short school days there.. anyway, please reply!