I got my new (10th Doctor) Sonic Screwdriver in the mail yesterday. It's my first. I'm a geocacher, so will likely find the UV light/pen helpful for some "mystery" caches. It's also already allowed me to log a "locationless" cache that required finding a Sonic Screwdriver. And I'm sure it'll help me out when working on people's computers at work.
I was watching most of them OnDemand just because it was more convenient, if I wanted to watch them in my room. However, they were missing multiple specials, so I would hop over to Netflix. Comcast still has season 7 OnDemend, though.