I have been using TSU9600 for years and years, since they first came out. I have 4 of them now. Last week I stumbled across a brand new TSU9800 on eBay and snapped it up for a very cheap price. It arrived today, everything included as per new plus two spare batteries. I've never seen a 9800 in the flesh before and I was surprised how big and weighty it actually is. The other thing is the screen has the same resolution as the 9600, but being a much larger size the fidelity of the image isn't as sharp and crisp as the 9600. I haven't played with PEP2 for probably 5+ years so I was a bit hazy trying to remember how to program it. Downloaded the firmware from RemoteCentral and uploaded it to the panel, easy. Here is my new 9800 next to a 9600 so you can see the relative sizes....oh well, I tried to post a pic here but it didn't work.