I have the Accuquilt Studio that I bought used. I use it all the time! To me, it is a blessing for two reasons. First it is not as hard on my arms/hands as rotary cutting. Second, it is far more accurate cutting than me doing it with a rotary cutter.
Half square triangles - I cut two strips the width (or is it depth?) of the triangle, sew them RST (love that acronym!) on both sides of the length (Makes a long rectangular tube), then carefully place them on the hst cutter and let the accuquilt do the rest. My HST are already sewn together when I take them off the cutter. Logically, I know that it is actually the same amount of sewing my way or the usual way, but there is less handling and it seems so much faster to me.
I really hesitated before I bought it, but am now thrilled to have it!