I was turned on to Sigs years ago, 80's if I recall correctly, by a buddy with Dade County SWAT. He swore by them. Ugly as hell, but I REALLY liked the way it felt in my hand. I bought a P226 and found that the combination of fit and feel along with accuracy and reliability were perfect for me.
I once rented a Glock and while it worked, it just wasn't as comfortable in my hand. It also felt loose to me. My gal just handled a Glock this weekend and she made the same comment, didn't like the way it felt.
I think the real turning point for me though was the P228. I've never in my life felt a firearm that felt as perfectly balanced as the P228. Pure sex.
I've never had a jam, never had a misfire, never had a defect in my Sigs.
IMHO the best way to sell a gun is to have the customer rent a few that interest them and let them decide. I'm confidant that anyone renting a Sig and having the extra cash, will step up more often than not.