Asia - Anyone used PassionAsia.com?

I'm looking to go to Angkor Wat and was looking at using PassionAsia.com for a 3 day/2 night package to Cambodia. Has anyone used them before? Are they a reliable tour company? Anyone have any recomndations for a reliable tour company to use for Angkor Wat? The rates I've seen are $400+ for a three star in Siem Reap which seems high. Thank in advance.

My wife and I travel within China in May, 2005 for 11 days with PassionAsia. Our guides and drivers were very good and very accomadating as we had several changes over the course of arranging the trip and during the trip. We had excellent hotels and meals throughout the trip. During our travels in China, we had two plane connections and one overnight train trip that went very well.