The first sheep I ever had, over ten years ago, were Suffolks. They are still my preferred breed, though now we only do rare breeds.
30% of my Suffolks had triplets, they all lambed easily, outdoors the first two years I had them, then they got posh and lambed in the stables we built. Lambs grew well and were up to market weight very quickly and with little hard feed. Found them a good deal easier at lambing time than any of my rare breed sheep. Never had scrapie either. The meat is delicious, and if you like hoggett meat, even better.
Woollyval is right though, as a terminal sire, the Suffolk ram is great. My neighbour farmer has over 600 sheep and uses only Suffolk and Charolais rams.