Zoom eyepieces?

I'm looking for a good all-round zoom eyepiece (not the Nagler Zoom). I have been looking at the following eyepieces:
Leica Zoom 7.3-22
Nikon Zoom 7-21, 9-21, 9-26
Zeiss 8,4-25,1
Pentax Zoom 8-24
Anyone who have made any comparisons or got any comments?

Thanks in advance,
Johannes

I have the Leica zoom and although I've only tried it out a couple of times it gave very sharp, crisp views throughout its range....at 22mm the FOV is a narrow 38 degrees vs at 7mm a wide 65-68 degrees. I did have the opportunity to compare the Leica to the Vixen 8-24mm zoom and the Leica was in a completely different league...being brighter, sharper and far more contrasty on planets. The initial impression of the Leica is that it truly is the finest zoom lense money can buy.

Have no experience with the Zeiss (I believe they are pretty expensive - comparable in cost to the Leica). However, I have the Leica and the Nikon 9-21 and I have used several others. Of the ones I have viewed through, the Leica is clearly the best. The Nikon 9-21 is not that far behind and, at about 1/2 the price and weight of the Leica, worth considering if you can find one. Don't confuse the three Nikons with each other, they are each quite different.