I feel your pain. I am not a dealer, but have supported Aloha for a number of years because the local dealer could not keep up.
Based on my experiences though, your comments seem to be accurate. Ibertech wanted the business, and if you had a legitimate complaint, it was usually looked into, even if you were a little guy. Radiant is focused on larger chains and corporate accounts, that's where the money is with their business model. I hate to say it, but as often is the case with big companies, they can take or leave your business. I like Aloha well enough as a product. But the more time that goes by, the more Aloha does not look like a great option for regional chains and independent outlets (at least as far as service and support are concerned).
I also feel the pain of the Aloha dealers though. They are caught in the middle, under tremendous pressure to sell by Radiant, which leaves little time for the service and support after the sale. You have to be really good at what you do-both business wise, and technically-to put a system in and have all the customers issues and questions resolved in a week. And when they have to move on to the next sale, I think it leaves many customers feeling ignored and unfinished.
Anyway, not gospel here, just my two cents worth based upon what I've seen.