We were lucky enough to get free tickets several years in a row. So I took sundry friends and relatives - although dh enjoyed it, once was enough for him.
However on the last occasion I took a friend who'd never been and had had a tough time generally, it was supposed to be a treat for her.
What a disappointment. It was cold and raining for much of the time, and we could find nowhere under cover to have lunch - the only place we found had an hour's wait. Having 'done' the marquees - so terribly crowded because of the weather - we ended up sheltering under a tree to eat something, and left early.
TBH I was appalled at the organisers, for failing to provide nearly enough places to eat under cover, when May weather is so very unpredictable.
Even if we had more free tickets I'd never go again - I'd give them away, same as once before.
I have also visited the Hampton Court Flower show, and do so recommend it as an alternative. There is masses more space for the crowds, there are much the same things to see - and possibly more of them because of more space - and in July it's certainly less likely to be actually cold.