I've never used one, but I'll give you a tip that Aly always gives, that I've used. You know those clear mats that you get to protect your carpeting? Get one of those and turn it upside down, so the 'pokey' things are sticking up. Place it where ever you don't want the Lefty to go. It worked great for Chester & Millie. I used it to keep them off the back of our new leather couch.

Much cheaper than a scat mat, and you can get one at Walmart. Plus, it's multifunctional!