Thanks for providing these! Been using my 4S and a stylus on Win7. It's been very responsive and lag free, though it's my first time using a tablet so I have no real point of reference. Only annoyance is that my hand touches the side of the touch screen sometimes, making Windows think that I'm trying to do a gesture and freezing the cursor, but it isn't hard to work around that.
Also, for those skipping to the end of the thread - if you've set everything up correctly but your computer still isn't responding to your inputs, you'll either need to disable your firewall (which can be risky if you forget to turn it back on afterwards), or create an exception for port 3333. If you want to do the latter on Windows 7, you should:
1. Go to Control Panel > System and Security > Windows Firewall.
2. Select Advanced Settings. (Requires admin rights)
3. Select Inbound Rules on the left of the new window, and then New Rule... on the right.
4. Follow the instructions in the wizard, selecting Port 3333 and UDP. Everything else can be left as is.
The process should be similar in Windows 8, but someone else will have to confirm that for me.