Montalbano is a very good antidote to the Swedish-noir detective series like Wallander and The Killing! You'll enjoy it if you think of it as a light comedy rather than a gritty thriller. It's not exactly Midsomer Murders, but it's closer to that than Morse.
It is indeed the first ever episode tonight (it was first shown in the UK in 2012), and there are 26 of them in total. I'd say the later episodes were probably better than the earlier ones.
Luca Zingaretti (the slightly maverick Montelbano) is an excellent actor and an Italian heartthrob. Watch out for Catarella, the overweight, bumbling station officer, the foppish detective "Mimi" Augello, and Pasquano, the implacably irritable coroner.
As for Vigata, the fictional location, the series was filmed in the south Sicilian towns of Ragusa and Punta Secca, and the scenery is stunning. Apparently tourism has boomed in those areas
Mrs O and I have seen the lot, and have thoroghly enjoyed them. Perhaps not everyone's cuppa tea, but once you get into them, and take them as they come, it's an undemanding, entertaining 90 mins / 2 hours worth of Saturday night TV.