I did quite some time ago, and didn't like it.
We did in '99, we declined the hard-sell on the upgrade and ended up with a pretty lousy car that must have been steam cleaned 5 minutes before we got it.
All week the thing fogged up every time we used the car. It was really annoying.
That said, much could have changed since then. Unfortunately, the mousesavers.com website doesn't suggest much has changed since then.
"The Orlando rental agencies that get the most complaints from MouseSavers.com readers are L&M and Payless. These are sometimes the least expensive agencies on first glance, but if you can find the right combination of codes, coupons and other discounts, I think you'll usually find you can go with a more dependable agency at a similar price. I've received many complaints about these agencies, including: car type reserved was not available at pick-up, aggressive selling of insurance, overcharging, poor car quality, etc."