ORION MK. V I finally bit the bullet and bought RapidCart. The interface and options are good (some features are a bit vague until to try them out), the cart very slick and I much prefer it to PayLoom. No complaints at all and the updates for it are automatic (though you can choose if you want to install them) when you launch RW, so that's a nice feature over most RW plug-ins which require you to manually update. I did encounter a few glitches in display for mulit-column cart layouts where it would sometimes not put the items in order, but switching to 1-column again, then back to that multi-column seems to fix it -- must be a slight coding glitch. Also, I had zero crashes during the 3-4 hours I've used it, so that's a plus. All in all, very nice.
(Version 1.0.12)