I used CubeCart for about two months; the support here is great I will say. However, I recently changed to OScommerce out of pure frustration at CubeCart. It was a decision made also out of curiosity as you don't just look in one shop when you’re looking to buy something for yourself do you? That is why I decided to trial OScommerce. I have to say, that I have had no problems whatsoever and find that it offers so much more. I had it up and running the same day, no probs. Within 3 days my store was customised and I am not a script wizard.
CubeCart version two in its original state is no comparison to the current version of OScommerce. To even get CubeCart up to a decent e-commerce standard that is demanded in today's rapidly changing technological environment you have to mod, mod, mod, mod, mod.... and this is where all the problems and frustrations arise.
OScommerce comes ready with a whole host of greater features such as the stock availability feature, product reviews and a superb Amazon style checkout as just a few features. The script is also much more solid. In addition, mods in OScommerce have not caused me any problems. The only downside is the initial graphics and display of OScommerce, but this can easily be altered. You also have to password protect the admin directory yourself which many newbies might forget to do.
Whilst I wish CubeCart 3 all the best, I can't help but think that the new version is now just touching at the same level with OScommerce. But it will be another 6 months at least until all the problems are ironed out and we are talking about major problems