Testimonials Testimonials > “They have been upgrading the avionics in my P35 Bonanza for a number of years. They are excellent to work with and have talented craftsmen performing the work.” — Rick Grossman > “Had some service work done here. The staff was friendly and helpful. Prices were comparative if not better than others. Id have no problem using them again.” — Matt Mansell > “Butler Avionics has earned awards of excellence for productivity. sales, and overall achievement.” — FDS Avionics