I have had my KLR for just under 2 years. I have decided to take the plunge and get the lowering kit. The bike is just about an inch too high, most of the time it is no problem, but on those occaisions when you have to back it out of an area that may have a slight incline, well, it can be a pain. I ordered the 1.5 inch lowering links off ebay, we'll see how good they are. As far as the front goes, no lowering kit needed, just loosen the eight, I believe, bolts on the triple tree and lower the forks the same amount you lower the rear. I bought a White Bros kit for my Harley one time and did not use it, I just lowered the forks the same way, no problems, they have been that way since 2000, and over 14,000 miles.
The kit is a good idea if you can't sit flat footed, or very close to it when you are on the bike. In reality without good solid footing it can be a hazard, just not as much control as you should have when sitting. Some may disagree, but in the 30+ years I have ridden, I have learned the hard way (at times) that good footing is essential. And really the lowering links are a very inexpensive alternative to lowering the bike.