I can answer any questions that you or others may have. Cheers!
Does the battery really take 6 hours to charge? and bad life?
Does it really take 3-5 seconds to delete a photo?
Focus points too centrally located and slow focus?
These are the common downsides...I don't believe it.
1. I haven't tested charge time and I don't have a dead battery on me. That being said, six hours seems excessive. As I recall the advertised shot count for one battery is right around 750. I personally have had great success with the battery's and feel satisfied with their longevity. I use both Pentax and off brand.
2. Just tested this. (Shooting full frame) Recording RAW to
two SD cards, it took almost exactly three seconds to delete a single photo. Do remember that this a 36 megapixel raw file, times two. Recording a JPEG just to
one SD card it still took about three seconds.
3. Not sure what "Focus points too centrally located" means, but I have no problems with the focus points and I would say the are on par with say Nikon or Cannon. I would say that the focusing is very dependent on the lens. All the glass I have is fast, and have had no problems (15-30, 77, 28-105 and 300mm).
THIS CAMERA IS NOT A SPORTS CAMERA. The buffer speed is horrendous. 10-12 shots and the buffer is full and you are dead in the water for a good 30 seconds. **EDIT** Just tested this on continuous high, I got about 25 shots before dead in the water. Not as bad, but you still have to be picky. This is, of course, writing to two SD cards in RAW.
Hope this helps!