I finally bought this unit because some reviewers mentioned that if they had a problem they could fix it. We were lucky that we didn't have any problems. My daughter, about 50 kg, loves it very much. We use it outside under her balance beam. Withstands the weather. We haven't had to inflate it since we bought it and installed it in early September (now October 18th). However, definitely spring for the 8-inch. In my opinion 4 inches would be too thin to be usable.
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