I like the Alto Quilt Cut. I do not have one but a friend does. It does clamp the fabric on one end and it does not seem like it needs excessive pressure to hold down the ruler and cut. There are angle pieces that come with it as well so you are not limited in your cutting sizes/shapes. I'd love to have one myself and keep my eyes open for a used system. But even at @ $200 new (I think that's about right), I don't feel it's too outrageous - just more than I care to spend since I don't really have issues cutting in a 'traditional' manner.
The other cutting systems seem, to me, to have a) limitations and b) consumables that end up continuing to cost $$ down the road beyond your initial investment. Just my opinion/impression.