The guy's name is Yukon Ho and he operates Ho's Electronics on Kingsway near Boundary Road. He's an odd duck but tons of guitarists and bass players use his services. He's worked on my SWR and has done lots of work for the two guitarists in my band.
Can't comment on Backline, but the fact that L&M use them doesn't inspire me in particular.
Another guy I've used succesfully is Jeff Fisher, Van Studio Tech, in Coquitlam: 604-931-1601.
And if you're into tubes you might call Dave Vidal: 604-437-3694
Good luck!
--
Rod