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Hi Darren,
I own a large collection of premium eyepieces, including Naglers and Pentax XW's. In your F10 Catadioptic scope, in most focal lengths, the Pentax XW's are better than Naglers IMO. It depends what performance characteristics your looking for in an eyepiece. When you read the eyepiece reviews on most forums, don't forget Naglers are an American eyepiece reviewed by Americans and often compared against a Japanese eyepiece. Put simply, patriotism and long memories can often introduce bias into a review. In addition, because of advertising in the USA there are 20 times the number of Naglers in circulation as there are Pentax XW's. Most people are going to say that what they own is the best, notwithstanding they have never looked through the competition to know that something better may be available. Either, are clearly superior eyepieces to the Meade S5000 plossls and the Meade S5000 UWA. IMO those are both just middle grade, notwithstanding the S5000 UWA aren't all that cheap.
If you buy Naglers or Pentax XW's you are buying a superb eyepiece and you would be very happy with either. The differences between them in most cases are very minimal and fairly subtle. Here are some that I see, having owned and used both in a variety of different telescopes.
The Pentax XW's have longer eye-relief and are more comfortable to use for long periods. They have a cooler more neutral colour reproduction, whites appear white as opposed to a very slight coffee stain with Naglers. The Pentax XW's have slightly better light transmission and contrast, hence they go a little deeper on faint targets. Naglers have a larger AFOV, 82 deg as opposed to 70 deg. This difference in AFOV is often not noticeable by some observers in the field, me included. It is noticed by others. In some focal lengths the Naglers are a fraction sharper at the EOF, not in others. In the short focal lengths (<14mm) the Naglers are smaller and lighter than the XW's.
CS-John B
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