The 'pitfalls' are that if you want to go back to a supplemental plan from an advantage plan you may be subjected to underwriting. This means as stated above additional cost for your current illness, the possibility that an illness may NOT be covered at all for a period of time (3 to 6 months I think). If you were off Medicare for an extended period of time, your will find there will be an additional monthly cost for Medicare, on top of the potential higher underwriting costs.
NOTE: there are some special circumstances that allow changing back, but these are few and very restrictive. I am NOT an expert in this area, this is a very quick synopsis of things we came across when we got involved with this situation. As I stated before, SHINE has very good information on this.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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