DD has one of the folding floor beams from The Beam Store that we bought at a consignment sale for $15. It gets used in spurts. The 2 year old likes "practicing" on it now. Grandpa made her a bar a couple years ago, it's in the backyard. It gets used constantly, by her and everyone else who comes over. Mostly it's commandeered for ninja warrior obstacle courses, but sometimes she uses it for gymnastics. There's a kip drill that's driving her crazy...
I am perfectly happy with those items and how they get used. If I had spent a bunch of money I might be more disappointed. I like the floor beam, it's significantly less dangerous and perfectly adequate for what they're doing at the lower levels. It folds away for easy storage when they get bored of it and then you can take it back out for them after a while and it's like it's new and interesting again!
But my view on stuff like this is that if it just becomes part of their active play and never gets used for gymnastics, I'm OK with that. We love backyard toys.
Now she's begging for wall bars. I have no objection to that because I'm sure it will be a ninja training ground as well, but I have no idea where on earth we'll MOUNT them.