comments on medi-gap vs medicare advantage plans

my partner currently has medicare A,B and D plus a medi-gap supplement policy. thankfully, he is now in good health and only takes a blood thinner. he wants to change to a more cost effective plan and after reviewing the companies available to him here in florida, i've come up with one that sounds like it will work for him.

i would just like to hear from anyone who has had both or who has the advantage plan now and could give me some thoughts on it, good or bad.

thanks! debi