I've ran a few logs over at ASF. Kratom is pretty individualized as to how you react to it. Not to make it sound scary, I'm just saying. The nice part about kratom is you can take it and still be 100% functional. It takes the edge off though, so the peaks and valleys of emotions flatten out. I would highly recommend getting the "sampler" pack so you can gauge what you like. I'd also recommend a 250g bag of a green and a red. I like the Old Forrest ones.
Red is best for relaxation and pain relief. Good at night.
Green is good for overall effect and well tolerated in the day by most.
Yellow is great for mood boost and mild energy. Day time.
White provides excellent energy boost. Definite day time.
Kratom energy boost strains are VERY clean. No jitters, crash, etc. The greens/reds that are more relaxing will not be so relaxing that you can't drive, etc. The effect is VERY mild and difficult to describe until you try it. Some people claim to get a "euphoria" from kratom, but I don't get any of that. It's definitely not a "party" or "woohoo" or "I got a buzz" type of effect. Just a very mild, at peace, kind of feeling. Yellow and whites are great if you need to mentally focus on something and get stuff done. If you take too much you may get nausea or eye wobbles. Just start with the scoop they send (about 2.5g) and go from there. You'll figure out where your cutoff points are pretty quickly. Just don't go overboard. Wait an hour or so between dosing yourself again. It's nothing like booze and it takes awhile to realize the feeling you get from it. Most of all, it just takes away that "itch" or urge to drink.
Here is my kratom vs booze log. A lot of guys helped me out getting started with it and provided a ton of good info:
http://www.anabolicsteroidforums.com/threads/96820-Kratom-vs-Booze-Log?highlight=booze
