We used autoslash and got a really good rate, only to find they wanted to charge us $12 per day! to add a spouse as a second driver. We kept it to dh. The other problem was very low choice on cars and none I could have driven anyway, being very short and needing to sit high up. They said Hawaii law allows them to charge for the spouse as second driver, but we did National through Priceline on Hawaii and we're fine, no charges for second driver and a nice 2012 Ford Fusion.
Liz
Liz