I've used spray twice and liked it once
The time I liked it - it was a small wall hanging and I was able to accomplish it by laying it on my front stoop.
The time I didn't like it, it was a twin size quilt. I didn't have a place to hang it, so I laid plastic sheeting on the floor of my husbands shop. It was very hard - even with two people - to get everything layered partly because our feet were sticking to the plastic sheet where we had overspray. It was horrible!!! On top of that, the spray DRIFTS!! And it can drift FAR!!! I was a good 12 feet away from my husbands "stuff" but we still found it to be tacky.
So I might use it again if it's a small project and I can take it outside on a wind less day ... but I will NEVER use it inside again - regardless of how much space I have. It was an experience I don't ever want to repeat. I doubt I would even do it if I had a place to hang the quilt.
I DID however really like the way it holds the layers together. It did the job.