Any love for the Dayton Audio waveguides? (Parts Express)

In particular, I have a project where I could use the 10" round version.
Dayton Audio H10RW 10" Round Waveguide 1-3/8"- 18 TPI
In that house, there will be NO on-axis sweet spot listening, it will be whole-house sound.

I've been kind of obsessed with the round Dayton waveguides since I feel that's kind of the "purest" horn opening for sound wave generation, which might not really be true but anyway. There is a wall with a big open space behind it, I could stick the waveguide in said wall with a big sensitive woofer(s), in-wall 12" grills I found.
System probably iPad --> AirPort Express --> maybe an EQ* --> amp probably a nice old Onkyo receiver used as a power amp.

* so I don't have to get crazy with the crossover and to level out falling power response at the top end)
 
I have a set of those 10” round horn lens
Yesterday I was look at them and thinking of what I can use them for
Hah, I'd buy them off you, but the shipping is surely more than the $11 these cost. Although that's without shipping, hmmm.
Selenium D220Ti seems liked by a couple but I have not seen measurements of anything. These seem like they would make a nice setup with a sensitive 10" in a generous undertuned ported box. Kinda like a gigantoid Buchardt A500! I also bet you could stick a 1" tweeter in there but again have never seen any measurements. I believe success in a horn setup is the freer the response from wiggles and squiggles, the less "horn honk" it probably has.
 
I used them with Selenium 1" drivers. They are OK. As TBTL mentions, the throat can use some work. I smoothed and filled to get a good match with the driver - and then could neither hear nor measure any difference. 😉