I feel you! I have that anxiety over buying play structures lol. I have been open 3 summers and have bought 3 large structures and sold 2!! The first 2 had swings but I have finally decided that I don't want swings so I think I'm content on my current one, the 8 in 1 little tikes structure.

I had 2 doubles but wanted a quad. I didn't really want to spend $1200+ though so I held off. I found a runabout on kijjiji that a centre was selling for $500 and I got it for $425!!! I am super impressed with it and love it!! I use it almost daily and it's a dream to push! When my fiancé comes with us, he jumps at the chance to push it lol.

I've used the quads that are side by side double and fold up, in a centre I worked at. While I did like that it folded, it was hard to fold, heavy to push and the brake handle had to be bungee corded or your hand would cramp holding it lol. However, if you don't have a place for the runabout than the folding ones would have to do and would be better than nothing!