Yes, never trust the word of a salesperson, after all most of them probably have never spent the night in one
There is a very good market in second hand CT's these days.
Most have moved on to caravans, CT's arn't always what they are cracked up to be.
They often can be difficult to errect, especially in wind and/or rain and some just don't offer the level of creature comforts people require when camping
Always go and have a look first hand, there is always things that you will like and things you won't like. At least with a manufacturer, you have the option to customise. Expect reasonable amount of $$$$ though.
The oztrail's are good, but they do have their bad points.
I purchased the camptop seperately and fitted it to a custom built trailer. The 'mounting kit' that oztrail supplied was pretty well crap, so I spend a great deal of time re-engineering to have it fit properly and securely. This may or may not be up your ally ???? If it is, then you will come out the other side with a quality CT otherwise you may be better off looking for one of the many companies that sell the camptop and trailer as a package. Still worth taking a look first hand though.
I personally would recommend seeking out one of the many second hand (used once or twice) CT's that are advertised, you'll potentially save thousands and have a wide range to choose from.
Hope it helps.