So I’m still not sure if you are talking about the fabric indoors that are entirely fabric and “round” or a steel/wooden building with just a fabric roof.
We have the later (fabric roof only, wooden sides and steel frame) at my family’s 16-stall boarding barn in MA. It’s 5 years old. Here are my experiences:
-I’ve ridden in indoors of all types in MA my entire life and I’ve never been in one where the snow/rain/wind wasn’t noisy, regardless of the roof type. Ours does make noise when the snow comes off, but I describe it as a “zipper” noise. I’ve been in metal-roofed indoors where the sound is much louder than ours.
-That said, I’ve found the major difference is that snow slides off of our roof within a day or two of the snowfall, whereas traditional indoors I’ve been in seem to have build up more snow throughout the winter and have one day where it all lets go come spring. That means we have more noisy days throughout the winter.
-The fact that the snow doesn’t accumulate on the fabric was a huge advantage several winters ago, when MA had a horrible winter with 7’+ of snow. We had indoors collapsing all over MA, and knew several other farms that spent small fortunes clearing their roofs where feet of snow had accumulated (one neighbor spent $7,000 to have his cleared to prevent a collapse). Throughout this entire winter, our roof never had more than a few inches on it at any one time.
-One thing we didn’t anticipate with the snow sliding off was that our driveway runs along the long side of the indoor. Unfortunately that usually means clearing the driveway again the day after the storm when the snow slides off. This would also be an issue with a traditional roof, but as I already mentioned, we get a release every storm.
-In theory we need to have our fabric panels tightened regularly, and sagging cloth would prevent snow from sliding off and be a danger to the structure. Ours is five years old and we have yet to need this, but I imagine we will at some point.
-As others have mentioned, the light is a huge plus - we really don’t need lights unless it is fully dark out.
-We really don’t use ours when our outdoor ring is useable, so I can’t comment on the heat retention in the summer. It is not attached to the barn either.
I hope this helps - as you can probably tell, we are very happy with our structure. Good luck!