I really like it. It is the computer I use on the sofa in the evening. It can still run my business applications and VPN into my network. But most of the use is e-mail and surfing.
The touchscreen works well, but some of the menu items can be small on some software. Setting the font size larger helps. For "precision" work, use the stylus. The stylus is also what you use for handriting recognition. I have found that the on screen keyboard is good enough for most of my input needs. I don't know what they have done to the screen, but it doesn't show fingerprints/marks nearly as bad as my HTC HD2. It's really well done.
Voice control works well, but it annoys my wife when I use it
The microphone is built in, so no need to add an external one.
As with the iPhone and iPad, the screen will change from landscape to portrait by simply tilting the unit. This can be annoying at times, when you really don't want it to change.
It comes with the charging stand and a case. I bought a bluetooth keyboard and mouse for "serious" work. One trick I've learned is that if you install the Slate into the case inverted, the case makes a very good portable stand.
Processor wise it is more than double the capability of "netbooks". It uses a 1.86GHz, dual core ATOM. Most of the Netbook are 1.3 or 1.6GHz single cores. It also has a video decoder so watching videos is very good. I haven't used it with Netflix, but I do make video files from DVD for use on the machine.
OS is Win 7 Pro. Again, it is setup to be a serious business tablet.
It comes with 64GB of Solid State disk. With the built in SD card reader, you can expand that as needed. I purchased 32GB and 64GB DC cards. This also makes it really easy to transfer files from my PC to the Slate.
Wireless N.
The only thing I have had any issue with is that you need to be careful with your hand/palm since it can be taken as input. Also, if you do any heavy work, the unit's back can get noticeably warm. Not too hot, but still, you'll feel it.
I don't know about other phones, but it "tethers" easily to my HTC HD2 over bluetooth. It can also do the same with USB.
Real world use, I haven't had it go battery dead yet. They say it is good for 6 hours of use between charges. I have watched movies for several hours on a plane and use for e-mail in the airport before and after. It still had 40% charge.
Speakers are a bit weak, but better than my old Netbook. A good set of headphones helps on a plane.
With it being as light as it is, I usually take it with me whenever I leave the house.
Again, if you want to run real business applications, the Slate is the way to go.