Sorry for not seeing this thread earlier.
We have the 80mm and 65mm Pentax scopes. In the 80mm scope we use a Televue Delos 14mm eyepiece giving about 37x. In the 65mm scope we use a Televue Delite 11mm eyepiece giving about 35x. We frequently use the scopes on reservoirs, ponds, fields and mountain peaks some distance away (watching raptors ride thermals).
We did compare the Pentax XW10mm against the Televue Delos 14mm in the 80mm scope. Pentax = 52x Televue = 37x.
Our binoculars are 10x (Zeiss and Swarovski 10x32).
In the scopes we like the slightly higher powers of 35x & 37x to be able to look at detail. We didn't feel that 52x (10mm) provided that much more detail to warrant adding it to the kit. The 10x binoculars provide the wider field of view when needed. By the time we are using the scopes we want to see individuals or count smaller groups.
We need a setup with 20mm of eye relief. When comparing the Pentax XW 14mm against the Televue Delos 14mm on the Pentax 80mm scope, we felt the eye placement on the Televue was easier and more comfortable than on the Pentax XW. Much of that will be personal preference. The Pentax XW provided a very nice image, but the Televue edged it out. The Televue is flat and crisp edge to edge. The downside is that you give up the water resistant feature of the Pentax XW line.
With the right fixed eyepieces the Pentax scopes really are up there with Alpha brand optics.
We don't mind the reduced exit pupils of 10x32 bins and slightly higher magnification eyepieces for the scopes. We live at altitude in an arid environment, and it is very bright. The smaller exit pupil helps stop down the light, which helps with eye comfort when out for a full day.
Regarding the Televue Delos and Delite lines... They are fantastic eyepieces in these scopes with one exception. The Delos 14mm works perfectly in the 80mm, but is not the best choice for the 65mm. In the 65mm the Delos 14mm will just come to focus at infinity, but will not focus past infinity on the 65mm. The Delite line works great in both scopes, focuses past infinity, but has a very slightly narrower field of view (2ft less @ 1,000 yds with 8-9mm eyepiece, up to 16ft less @ 1,000 yds for 17-18mm eyepieces).