I have an Avent Isis manual, that I really liked as a manual pump (I used it when I wasn't working, but needed to leave DD occasionally and wanted to leave BM in case, and also used it on road trips, when I could pump while we drove and give her a bottle rather than us pulling over to nurse). When I went back to work PT and had to pump 2ce a day when I worked, I borrowed a Medela PIS from my cousin (who "nursed" meaning she breast fed for about 3 weeks then transitioned to formulat full time by 6 weeks, but is well off so plunked out $200 on the fancy pump

). I LOVED the PIS for that level of pumping. It's very nice if you have the money or prescription. And you can get it used and buy a new set of all the pieces that actually come into contact with BM (you can get them from medical supply stores or any place that sells a good range of pumps and gear).
I also rented a hospital grade pump for a week (due to nipple trauma, I had to pump for 24 hours when DD was 7 days old), and I think the PIS was comparable.
If anyone is interested in an Avent Isis pump, I have a 2nd one that I'm selling on the trading post but haven't had any nibbles yet. It's $6 plus shipping for the pump and all the spare parts - everything that comes with the pump except the 4 oz. bottle, ring and nipple. But the pump fits any Avent bottle, so it's easily replaced. Seems to be in pristine condition and looks like it's never been used. I bought it from goodwill b/c I wanted to find it a good home - but I already have an Isis and don't need 2. It's $6 plus shipping - a great deal as they sell for around $40 new (and with the MIA bottle). PM me if you are interested...