Over on Reddit.com there's a good discussion (with plenty of feedback) to a user looking for "a PHP ecommerce solution that isn't terrible" to replace their aging implementation.

I've been using Lemonstand V1 for a couple of years now, it's been really decent, though they're zoning it out to make way for V2. They're moving to a cloud hosted monthly cost, without a lot of core features from V1, which means my agency needs to find an alternative. Obviously the one that stands out is Magento, but I've logged in and clicked around and looks so bad. [...] I have recently found "builtwith.com" which seems to show usage stats for different ecommerce systems, though I cannot seem to find anything very good on that list which looks reliable. The most promising thing I could find was called "Sylius" (http://sylius.org/) which looks fantastic, BUT, it's newish, and there are no docs, it's not being supported by a company, it's only being held up by the community. Can anyone suggest any other alternatives to look into?

The comments to the post range from suggestions of other solutions to attempts to reinforce ones already mentioned:

• "I'd go with the biggest names in eCommerce for PHP. That will give you the most leverage. We run our own ecommerce software and when your missing a community, features, and market share, it will be a ruff battle selling customers on your solution who are aware of software like Magento."
• "No, sorry. No joke. Every ecommerce solution I touched is terrible. And Magento is hell."
• "Drupal with the Ubercart module is pretty nice."
• "You have checked out OpenCart, haven't you?"
• "WooCommerce has been pretty good if you're on WordPress. Actually similar to Magento."
• "In my experience none stand above the rest and all have their drawbacks, especially when you just need to getting something slightly custom up and running. We most recently used CS Cart and it was not terrible."

Check out the post for more feedback and suggestions.