Vince does have a point. When Cub first introduced the 5000 series in 2004, they had some issues with the machines that earned a ding in their reputation and some bad publicity which you can find on the web. They resolved the issues in the following years. Having said that, my first sub-compact was a 2004 5234D with a loader, and I had 0 issues with it. I worked the loader pretty hard, which probably isn't so advisable, as I believe it is a lighter duty machine. I firmly believe if you don't overwork the machine and service it regularly it will serve you well.
See if it has the serial# on the lower right side frame, you can run a warranty check with Cub. Most of the leftovers Cub has been selling in the last 2 years are new/like new, low hours, with no warranty and usually the serial#'s are removed. They were sold quite cheaply to clear inventory and make way for the new Cub/Yanmar line. The machine you're looking at may be one of them. Mine is one of them, It doesn't worry me at all, but it also had 3 hours on it when I bought it.
The loader is a quick-disconnect, remove the front pins, rear bracket plates, set the loader with hydraulics, and remove hyd couplers. 15-20 minute job.
It probably won't come with a manual, you can print one for free off the Cub website. If you don't have a serial #, let me know, I have some codes to plug in and get the manuals up.