I haven't used one, never even seen one, but they get mixed reviews over on the EP forum at CN:
http://www.cloudynights.com/ubbthrea...fpart/all/vc/1
The issue that would bother me is that in the US the X-Cel is a $60 EP and they are built down to that bargain price point. So paying almost two and a half times US retail for that EP would not be attractive to me if I had around A$145 to spend.
Fortunately you have a much better alternative available - a 20mm TV plossl for A$125 which is a really excellent eyepiece for less cost.
The plossl has slightly less FOV (55 v 50, but getting a 20 instead of an 18 will compensate for that) and tighter ER - about 14mm, but 14mm is comfortable unless you wear glasses in which case it would be marginal. In the US a plossl is a $100 EP so you are getting much better value for money too.