I very much like Signed, Sealed, Delivered, I discovered the series a few years by stumbling upon episode 6 of season 1. So I'm now catching up (finally!) on the first half of season 1. Last week I finally watched the pilot.
This episode was very moving, and deals with the aftermath of 9/11, and the neverending war in Afghanistan. I'm not sure where the war scenes were filmed, but all credit to the location managers. The episode deals with courage, loyalty, loss and redemption.
Kristin Booth plays Shane, and sometimes I get her mixed up with Kristen Bell because of their names, perkiness and resemblance.
Signed, Sealed, Delivered is a warm series which I can watch over and over again. If you're into "nasty twist" series like Inside No. 9, Room 104 or Black Mirror, then I think you should watch Signed, Sealed, Delivered for a more healthy dose of optimism.