We put five ways as our second choice too, but we did go to visit it a couple of times on the open days. It is a long way, but they have a bus which I believe goes from the Maypole - from what you have posted before I am guessing you live round Hollywood/Wythall way? I think the bus is expensive (around £360 pa), but it is very fast, in fact, I don't know how they get up to the Maypole so quickly.
Many people would give their right arm to get their children into Five Ways, so your son has done well. I also know that many people choose Five Ways over Camp Hill because it is mixed and they want the balance that it gives. I know about five families whose children go to Five Ways and they are all very happy with it.
The facilities at the school are top notch. The sports facilities are very good - large playing fields, climbing wall in the large gym. It struck me as quite traditional, but if my daughter hadn't have got into Camp Hill, I would definitely have sent her to Five Ways. The music provision seems on a par with all the other KE schools. Oh, and they do a Geology GCSE which my daughter liked the sound of - I think they had some sort of a rock collection (I remember something, but I looked at a lot of schools). The headmaster struck me as strange because he wore a gown when he delivered his speech which started with something like - I know that the majority of your children will not get into this school, but . . . Make of that what you will!
It is your decision, but a friend of ours sent his son to KES after he had been at KE Aston for some time. He said that KES was exactly like KE Aston, except that you had to pay!! This was a few years ago now, but was a comment that he passed on to us.
I have had another child at Camp Hill for some time now and am very pleased that my daughter got in too, but I wouldn't have hesitated to send her to Five Ways. She too got into KEHS, by the way, but I still think I would have sent her to Five Ways before she would have gone to KEHS, mainly because of the narrowness of the curriculum there.
Hope this helps - it is just my subjective opinion. Hopefully there is someone reading who has first hand knowledge of the school and can give you more advice.
Well done to your son.