I did the Lemosho route which is one of the longer trails. The team of porters&guides were friendly, pleasant and always happy to help (one day, I was so tired after the days hiking that I locked my keys in my duffel bag-one of the team had the bag open within a few minutes using a rusty nail he found on the ground!).This really made the experience a lot more enjoyable.
Climbing kili was a lot harder than I expected-I suffered serious altitude sickness on the summit day and stumbled slowly most of the way up. I doubt that I would have reached the summit without the support and encouragement I got on that last day.
If at all possible, the climb kili guides will get you to the top of the mountain!