Thank you for the compliments.
So far we only tested alicommerce against 20,000 products and it handled pretty well. I'm pretty confident that a correctly-configured alicommerce store should be able to support much more than the amount.
In alicommerce 3.0, we plan to add the following features: gift certificate, customer management, drop shipping, most popular products, address book, category offer, email a friend, wish list, support for terms and conditions, order edit, low stock report, coupon code report. Of course we need to work on more documentation. There will be a wiki website too.
We only provide free email and forum support at the moment. We plan to introduce Instant Messenger (IM) and phone support for some customers next year. It will be not free though.
So far, all upgrade is free and we don't have plan to change it at the moment.
Hope I have answered all your questions.