Don't know them, never heard of them. I would judge it by how hyped up the ad was on guru.com. There are a whole lot of "jobs" out there on various employment boards (not mystery shopping websites) that make mystery shopping look like an exciting, fun, very lucrative business to get into. Step #1 is always to send them money for 'leads', Run, don't walk, away from these things. Any Joe Blow can sell you a list of shopping companies that you can get for free here, at Volition.com or on the MSPA web site. Those 'employment' boards are also often rife with making money by processing rebates, making money stuffing envelopes and all the 'standard' scams. While there may possibly be legitimate business opportunities in these areas, you will NOT get a decent and no cost start through the ads.
If you are interested in shopping, go to the Company list at the top of the Mystery Shopping Company Discussion area of this forum. If you want to know what is entailed in being a shopper, check the sticky threads at the top of the New Mystery Shopper section of this forum.