I have several Ridgid cordless tools, the initial Lithium 18 volt line. I have to say I love them. Plenty of power, quick batter charges, and they just feel good in your hand. And the free batteries for life program is great. I've replaced two of my batteries with no hassle whatsoever, and that alone has made Ridgid a worthwhile purchase for me. You DO NOT have to send in the whole set to get replacements.
That being said, I don't know if I'd recommend them for professional use, or at least I'd ask you about your climate. The batteries I have do not work in freezing weather. Building a deck in the winter was an exercise in frustration. Maybe they've fixed this issue in the newer versions. I don't know. Maybe this is a problem for all lithium batteries. Beats me. But if you do a lot of outside work in cold weather, it's something to think about before your purchase.