I bought the SGP 5.0 in Feb 2012 while on a shopping spree to the USA. (I haven't found it available in Ontario, Canada).
I find that I use my SGP 5.0 way more than my larger SGT 10.1 (P7500) even though I managed to get it at a lower cost than my SGP 5.0.
I like the fact that with "MapDroyd" and "NavDroyd" it becomes a totally functional GPSr without the need of wifi.
With YouTube Downloader I can save all kinds of Video for later viewing.
It supports all kinds of e-reader apps, I can check my e-mails, Facebook and with Tapatalk I can easily access my favorite Forums quickly.
I have a case for it that I can attach to my belt via the belt loops. This keeps it safe and secure when I am mobile.
The idea that it also has a camera for stills, video and Document scanning as well as having a built in FM tuner is fantastic. Add to that a Calendar for scheduling and an audio recorder for taking quick notes as well as access to voip (when wifi is available) to make free phone calls. It is an all-in-one device.
If I need to I can tether it to my SGT-10.1 and use the 4G service if required.
So far no complaints at all.