My wife gave me the set for Christmas. We binge watched it over the last 10 days. This is a great series. The stories are very good, and were very timely for the time it was made. The acting is wonderful. Helen Mirren is just fantastic, and watching it over a very short time helps really flush out the characters' lives. It also helps to remember everything that's gone before. The subtitles were a big help, especially for series 5 set in Manchester.
The video quality is very variable, some of it is very poor, and most of it was originally framed 4:3 and presented now 16:9. It makes for some very interesting shots where character's faces essentially completely fill a screen. (For some reason, one segment of series 4 was shown 4:3.)
I would strongly recommend this set for anyone who's a fan of the series which was truly one of the gems of Masterpiece Mystery!