I too have gone too Harbor Frieght and purchased the same saw for the same as Washington Hunter and have to say is for 20.00 bucks you can't beat it,it works just as good as the high priced arrow saw's. Atleast for me it does.. The tube cutter does work thats what i started with ,
the trick is you have too remove the burr for the insert to slide in more easily a countersink tool will work for this.But you can't beat the minie chop saw for the price do the the job..
And i'm sure there are others that use this saw as well..