The lovely thing about olympia is you get a good view from everywhere. If you can in future though the very front row is good for catching rosettes, especially if you are at one end of a long side or another.
The members area bit is not very exciting. It does have a sit down area to eat where the food is ok, but its pretty busy. It also does have a very quiet area where you can squat on the floor if you need down time.
The shopping is a big part of it, it gets very busy so allow plenty of time to get through the crowds. Watch out for when autographs are being signed. dd met her hero Ben Maher once and he was lovely.
Food wise, there are lots of stalls round the edge selling junk food. Also a pizza express, but seating is tricky. Outside about 5 minutes away theres a nice cake shop but I forget how we found it.
We always do an evening show, probably started when dd was 9 I think. It's so exciting that they dont seem to get tired - lots of razmataz going on and the jumping sessions arent too too long. I probably wouldnt go and see the dressage with a youngster, we are going to the puissance which is very exciting!
If you are going to an evening show dont attempt to do any shopping when the afternoon crowd is coming out. Mayhem!
Thats all I can think of for the moment. Feels like Christmas has started once we get to Olympia :)