Have you tried a June Tailor Shape Cut flexible mat for rotary cutting? Makes it much easier to cut strips, squares and rectangles.
The Simplicity cutter has gotten really bad reviews; don't waste your money.
I have an Accuquilt Go! and really like it for triangles. Also like the strip cutter die, although I think I can rotary cut strips just as fast manually using a Shape Cut mat; it's just that the strip cutter die ensures accuracy.