I got the Alpha invite in April but the client was so unstable I decided to wait a few months before trying again.
I finally got to try it today ^_^
I played both tutorials and got the basic jist of combat.Aside from a few things, it didn't feel much different from SCII and I don't just mean because they're both Blizz games XD
I'm sure my opinion will change once I've spent more time in it this weekend. Shoot...I'm in the Alpha so you can be sure I will try everything out. Would be cool to me if Blizz figures out a way for you to use your WoW Chars in HOTS =D
Also: I took a look at a few threads before posting and feel the need to remind folks this is the freaking ALPHA. Not even the Beta but the Alpha. We're just testing the game to make sure the game itself works. Of course it's gonna feel unpolished. All the fine-tuning will happen in the Beta.
As an aside, the Dual Payment option gives folks a sense of weather they wanna grind Gold or pay with Cash to get what they want. It's all about what makes sense. Me personally, I'd like to see this (Dual Payment Option) come to WoW. I'll make a thread that speaks to this in the WoW forum shortly XD