A few days ago I stopped at Rosen's in Petaluma and got a slice of cheesecake (plain) to go. I was stunned at the price, $7.50 I believe and can't remember whether they added tax on top of that. But as others have said, it was as perfect as I could imagine. I don't know what I would change.
Then a bit later as I was driving past Novato on 101 I decided in the interest of science to stop at John & Jill's. They happened to have one slice of plain cheesecake available so I got it. $1.00. No tax. It was frozen so I brought it home and ate it a few hours later.
They weren't exactly the same, and since time had elapsed it was hard for me to describe to myself the difference (except for the crust). I thought maybe I preferred Rosen's, but it was by a small amount. I did prefer the crust on the Rosen variety to J&J's which had a thicker graham cracker/cookie-type crust. Some may prefer that thicker crust. My preference is for a less "instrusive" crust.
But J&J's was great, and for a small fraction of the price of Rosen's. I realize I'm comparing restaurant prices with a factory-second price, but... I didn't get a J&J price list and don't know how Rosen cheesecakes are priced in markets.
J. M. Rosens Waterfront Grill
54 East Washington St.
John & Jill's Cheesecake
4 Commercial Blvd