I have a Train-Li and have used it over at least 1000 ft of track and if I lost it today I would get another one. Axel Tillman and his wife run Train-Li and they are real quality folks to do business with. And as Greg said I don't by cheap tools.
First question is the one you found "on sale" the new dual track bender or one of the older single track benders? most folks agree that while a rail bedner is great the work saved in bending both rails is well worth the extra cost of the dual bender.