regarding shabbos the biggest change i will do is use my pinky instead of my thumb or pointer.
i have used the cgm for a little and then stopped because every time i pulled out the needle in the middle i had a geyser of blood coming out. furthermore after a day and a half it started to burn.
regarding the medtonic pump i love it because it is so much simpler to use and it does have an audio bolus that i use a lot.
whatever you choose csilver will be good. all the pumps basically work the same.