That's a good starter system. The base machine will have 128K and I think the jrCaptain adds at least 256KB, a clock, and a parallel port. The scanned docs are on the other part of the web site.
The composite monitor output is tolerable with a monochrome monitor. I used my machine like that for all of it's life - it had an Amdek 300A monitor. Sixteen shades of amber wasn't great for gaming, but not having three guns to focus made it a sharp display. I didn't own a real PCjr monitor until 1992. Running the composite output through a VCR or to a television is passable, but you definitely don't want to be reading that for more than an hour at a time. If you have a CGA monitor around you can run it with an adapter. The PCjr has non-standard connectors for everything, which is a pain, but that's part of the "charm" of the machine.
Be careful - that's a 16 bit system disguised as an 8 bitter. The 8088 is a weirdy, but I think the 16 bit ALU qualifies it as a 16 bit processor. It's kind of like the 386 and the 386SX were .. in that case you had a 32 bit system masquerading as a 16 bit system.
I would never try to compare a 25 year old machine to a modern machine. However, it is still a pretty capable little system. The games are still playable, and I can get mine on the Internet using Telnet, FTP and IRC.
