I've installed it on a few boxen. It's useful if you run a traditional B2C, catalog-based business, and just want to get your biz online fast.
It has the ability to up & cross-sell, and some degree of crude "personalization" based on shopping behavior.
It can use PG or Oracle, so transaction support is there.
It can also connect to the [bankrupt] Cybercash and Verisign.
Download RedHat 7 & give it a try. It took me about 10 minutes total to get their demo store up and running, last time I tried.
