Petsafe Ultrasonic trainer

Has anyone ever used this product from Petsafe?  The house I bought has a petsafe fence, so I may get the collar-- but wonder if the trainer works at all.  Its main purpose is to correct my wonderfully behaved Cockapoo when she's outside.  You see, we have a beautiful lawn and garden, thanks to the former owners-- but my dog races through the garden, destroying all the flowers and plants out there!  It drives me nuts because I would call her to me, using an even tone so not to scare her, and then I'd put her on her leash.  Well that doesn't seem to be sticking.  So I would "ignore" the bad behavior-- much to my dismay-- and praise her when she'd not be tearing through the garden.  Well, who is kidding who-- she looks at me with a look of "I don't know what I did but I'll take a belly rub!"  So now her latest conquest is th few vegetables that I planted this weekend.  I even fenced them off to protect them-- but no luck, she ate them.  Inside, she's a sweety and doesn't do much wrong.  Usually, when I'm outside, she's ok too, but still craves mulch (I have a ton of chew bones and toys for her and they all end up on the deck yet she favors the nasty, splintery mulch). 
 
Anyway-- just wonder if this electronic arm of correction would be worth the time.  The expense of replacing the plants is adding up.