Well I would disagree with the "no deal". I'm not sure what the new retail price will be but I paid $28 seven years ago for BS2. Just adding cost of living increases would put that price well above $25. So I'm guessing this is a 30% to 50% discount over what is list.
That said if BS2 works fine for you then not a lot of push to update. Other than support for a developer who's software you use. I got a lot more value than the $4 a year BS2 cost me. And Brad did a number of updates that fixed issues I had. I assume others had similar issues, but the point is the software had continuing development and bug fixes.
Personally I'm fine with BS2, it does most of what I want and BS3 might not add anything I desperately need, but I bought the upgrade when it was announced because this is software I want to support. I might find I love the changes, but I updated to support the development.
I don't use the cloud except for occasional recipe transfers, and I use this antique thing called a "backup" so I'm not that worried about loosing all my history. But my general workflow is to develop the recipe in BS. Print it out and take notes on brew-day, measurements and the odd substitution, transfer that into my handy BASIC BREWING LOG BOOK and eventually update BS. I use my own software for BRIX to SG conversion (though maybe if BS3 has updated the formula I can do it in BS?), so those are the numbers I enter into the log book.
Convoluted? A bit. The Log book is great for following the year and looking at what I was brewing when, and it has more notes, BS is great for searching and developing recipe's and as a safety backup of the log books.