It can work, but it's a lot of work to get your ads set up properly. Mistakes can be expensive as it isn't incredibly intuitive to use at first.
I use it for my
Volvo ABS module repair and Exchange business and have for about 3 years. I've also tweaked it dozens of times in those years of using it. I pull about 9 conversions a month out of 300 clicks. Those 9 conversions are my least profitable sales in a given month but still very profitable. I'm already #1 in organic search with that business, it just makes my presence that much more and also shows my ads all over other websites. I pull a lot of those sales from my ads showing up on Amazon, various forums, etc.
But....with that business I have very few competitors, it's nation/worldwide and they are looking for one very specific product. I'm the only person in Michigan doing it and also the entire midwest. It is also something they need or must have.
I did try it last year with my PW business and won't do it again. It just didn't work for me with that business, not one conversion. Everybody clicking on the ad wasn't looking for actual service, they were DIY'ers looking for really cheap shit.
Downsides...
Competitors clicking on your ads to drain your budget, and it does happen. Ignorant people clicking on your ads looking for free advice, miracle soaps and homeowner level equipment. Google is good about taking care of you if you show them the pattern of the same person clicking repeatedly, but that responsibility is on you. If you're covering a large/populated area expect it to cost you $150/month depending on what budget you set.
Since you have a credit to burn, give it a shot. But, in my experience the time and money spent with AdWords in our field can be better spent on other marketing avenues.
I'll also add to COMPLETELY AVOID paid facebook advertising. That was by far the sketchiest advertising experience I've ever gone through. Getting billed for lots of clicks, but mysteriously very few of those clicks were registering on StatCounter or Analytics. 83% of them actually. I only lost $80 in that ordeal, many others lost thousands. It was shortly after they went public, there were hundreds of complaints just like mine.