Our view is that swinging makes sense for us, but not necessarily for everyone. We have been together for over 20 years, never cheated (although we both had the chance), and are only a few months into the lifestyle. We're very open with each other, we know each other's fantasies and communicate absolutely everything. Even with all of this going for us, we were still not sure if swinging would be for us until we actually did it. We were not sure of the exact emotions that we would feel, we had an idea but there was always some doubt. We agreed that this was an experiment and if either one of us did not feel comfortable, then it would stop. So far, it has not stopped!
You'll read this over and over here: this lifestyle won't save your marriage if it's in trouble. It won't make you a better spouse. It won't change you into being a better person than you are now. The best advice we can give is that if both of you are interested and curious, set some rules and give it a shot! Just don't assume that you will both like it, one or both you may not.