Flexwatt is really awesome stuff, however, you need to wire it up properly and then cover the exposed connections the right way. Also, in under the tub applications, I think alot of people wear away the milar coating by placing the tub in direct contact with the flexwatt and the drawer getting pulled in and out wears the coating away, exposing bare electrified wires...
If heatrope is easier for some people, that is fine, but dont blame the flexwatt for your inablilty to connect and operate it properly? Flexwatt is cheap, because you are required to supply the line cords and make the electrical connections yourself...thats the whole idea - no?
Make sure you draw out your wiring diagram and verify the circuit is correctbefore you begin the wiring process, get rid of the stupid clips and solder directly to the Flexwatt matt, cover the exposed wire and solder joints with both a liquid insulator and electric tape, use a high quality termostat.
Flexwatt Rules!