The best built al-az telescope on the market today is Dave Kreige's Obsessions. For large aperature scopes, no-one else appears to offer the same value for money equation. They do cost, but you pay for quality. There is a local amateur here in Australia who makes Obsession clones which are as good if not better for a more modest cost.
To get to my point, Dave has updates his web site. If anyone is interested, please goto.........
http://www.immersivephoto.com/obsession/
http://www.immersivephoto.com/obsession/news/index.html
http://www.immersivephoto.com/obsess...2-5/index.html
http://www.immersivephoto.com/obsess...ist/index.html
You will be impressed.