The weight and bulk are so similar to a K-r that there only seems a size/weight advantage if you use the 40mm kit lens. In that case the backward compatability is no great advantage. The thing that manufacturers don't understand about viewfinders is that they have dioptre adjustment. There are 20 million people over 50 in the UK and they hold 80% of the wealth. The majority of these wear reading glasses like me. This means you have to put on glasses every time you want to take a photo with an LCD screen whereas the viewfinder can be dioptre corrected to negate this. So in my opinion this makes the camera an unlikely purchase for a massive number of people.
Dave

Ricoh really should use this kind of stuff. Need to have some young stars as well and make it "an always cool" kind of ad.

Well especially if it's a WR version I think you should rush down and buy it. After all it's a £479 lens!

Just watched it! Oh to see that Spotmatic that changed everything in the sixties. I was in my late teens then and believe me Pentax was cool!
Dave

I can't weight (sic) to try it with my Sigma 150-500mm.

If budget is a constraint why not go for the DAL 55-300mm. Same optically, I wouldn't worry about the plastic mount or the hood, just the quickshift which is handy but is it worth an extra £100? That way will only cost you about £20 more than the Tammy, which I had before and thought was good value, but not as good as the Pentax.
Dave

I got my KPS from this guy. Although at first the P&P looks high I got mine for 99p so it was a big saving and he was very helpful with a couple of questions I had.
Search item no. 330665751105
Dave

I'm getting on a bit but I have a feeling you have been a lurker rather than a troll, which are less popular, but we know what you mean and welcome

Well this one definitely works, at least mine does, tried and tested,
"I can now confirm mine does work with the DA* 300mm as well.
Exact Markings are:- Pz-AF 1.5X TELEPLUS MC..... KENKO....(in white) DG (in gold)"
Look in the lenses forum to see the thread.
https://www.pentaxuser.com/forum/topic/teleconverters---again--32509/p-1

Yes and I've added a bit more to the link above.