I'll be cutting mine with a hand held hacksaw, fitted with a good blade. OK I might tidy them up afterwards with a hand held 4" angle grinder if they need it. But whatever I do to the tubes they'll be well held in a metal vice, something that that claimed metal cut off saw doesn't have! And I certainly wouldn't go anywhere near it if anyone was using it without a good secure clamping system. A G clamp holding the tube in place doesn't count as a good clamping system.
If I was going to invest in an appliance to cut the tubes then I'd go along these lines;
http://www.google.co.uk/products?hl=...ed=0CCgQrQQwAg
Steve