My thoughts:
0) "The price is right." is the wrong reason to buy a camera, especially an unconventional one like the K-01. I've had to quit many, many threads to avoid saying, "I don't know, why DIDN'T you buy the Sony/Fuji/Oly/Pana you obviously wanted instead of the K-01? Are you dumb, or just cheap?"
1 & 2) As others have said, the K-S1 is also an option, if you shop around. (I have both)
3) My first thought on handling a K-01 was "the green button is in the wrong place", but it really isn't a major issue. The odd ergonomics are actually better than some DSLRs when wearing gloves.
4) The rule for the K-01 is "Small and bright, works all right. Long and slow, it's no-go." Besides size, the 55-300 isn't a good match for CDAF focusing. The Sigma 10-20 isn't too bad, but you have to shoot old-school, with the weight of the lens and camera supported by your LEFT hand and the right just providing control, rather than having all the weight on your right and a "death hold" on a fat grip.
5) I don't usually wear sunglasses when I'm shooting. I've learned to live with the LCD; if there's enough image to frame the composition, I don't worry about the details. Try shooting your K-30 outdoors in LiveView only for a day or two, and see if you can stand it.
6) After two weeks of accidentally banging the K-01 into your forehead, the swelling goes down and you discover you love The Brick!
I struggled with it for about a week, then threw out the neck strap and shot with just a wrist cord. That really opened up a world for me of shooting at arm's length and angles that I would never bother with a DLSR - I'd have to make a conscious decision to use LiveView, flip the neck strap over my head, put the camera in LiveView, work out the shot, take it out of LiveView, put the neck strap back over my head, etc. I'm much more spontaneous with the K-01. In fact, I shoot the K-S1 with just a wrist cord as well. I hope Pentax continues experimenting with a "minimum size" K-mount body, but I'm probably in the minority.
Last edited by THoog; 05-13-2016 at 02:18 PM.