I have tried them both and settled on 1.5 just because of the dictionaries and RSS feeds from mobi reader software.
No problems at all, and I love the way the dictionaries work. It was the one thing lacking with the 1.9 firmware.
I had a problem with one ebook because it kept on going back to the menu, or freezing when I selected it when using the 1.9 firmware. All my other books worked fine, so I thought it was just the one ebook causing the problem. When I went to the 1.5 firmware and converted it to mobi it works fine now.
I may change in the future if I can't get the books I want in the mobi format, but for now I am very happy with 1.5.
Gray
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