If you want a dead man switch then what Chailatte described is how it should work. No way should a DMS start up a machine when you press or release it. You always should have to press a momentary PB to latch the supply back in
I have a table saw and a plunge (track) saw. For me that's all I need so I don't have circular saw anymore. When it comes to cheap gear I have found the build is usually OK. The problem usually is the quality of the blade. I bought a performance power table saw from I think B & Q. It was...