Designer One the newer version of 1+ . Also has drop in bobbin.
The 1+ also does pictograms, which means it has pieces and parts of designs you can embroider without a hoop.
I made Holly and Candles. It's a lifesaver.
If you have a Viking dealer, go look in the Viking books. Someone put out a very good book on how to use all Viking feet. I had it and sold it with my 1+. It's sold by Country Stitches. You can take a peek in the book if they have it.