DS2 and I went to look at KEGS back in March. We both liked it (and the Head particularly impressed me), but in the end decided that the school didn't really have anything that we didn't have on our doorstep - we are a mile from WHSB and about 2 from SHSB which is our first choice.
I have to say that the thing which concerned me most about the facilities at KEGS was the apparent lack of lockers in the sixth form block, leading to piles of belongings everywhere - good thing for them that presumably no parent being taken round was a member of the Fire Brigade
However, I appreciate that it is a very good school, and apparently the off-site sports facilities (though very off-site) are excellent. Not at all wishing to put anyone off WHSB, but if KEGS is your "local" GS, I would go for it