thank you everybody for you advice but after doing a little reasearch i think im going to go with the MM 722 because it has a 300 unit resivour and my doctor said that 200 probaly wouldnt be enough for a 3 day use so i would have to change it every 2 days which i dont want to do but i still am thinking about the ping i cant get the pump till april but just want to be sure by then
