There are none that I'm aware of. They do make small changes from time to time, but they don't make any announcements, so you basically have to wait until a user "discovers" something is different.
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A year ago, my wife bought me a smart hub and a 5in1 on a click thru deal from the WeatherUnderground site for IIRC $110.00. Too low a price to pass up, except now I have to replace the hub. That's why it was so cheap I guess.
Not to worry, I just used my "unique $90 discount code" ($88.63, when I used it) to purchase the equivalent bundle again, this time with the access hub and a 5in1, for a total of around $61.00. Such a deal!
The plus is I get the new hub for $40 and a backup 5in1 for "just" an extra $21. Silly game. At these prices, that's why I'm wondering if at some point in the not too distant future the current 5in1 won't be superseded by a new and more desirable unit, after Acurite has sponsored a sale period to sucker customers into buying the old one for cheap. $21 for a 5in1 I can't pass it up!! But I don't suppose all of the old 5in1's would be bricked in the way that the old smart hubs will be!
I can understand why so many customers are miffed in so many ways. Also, if I had known a year ago that we would have spent close to $200 by this time, even if it's at steep discounts, I would have opted for an Ambient Weather station in that price range. They seem to have have more features and more capable software.