We called these guys to have a small spruce removed from our front yard. We did some shopping around, and these guys were both the nicest on the phone and the highest-rated on this site, so we called for an estimate.
They came and gave an estimate, which ended up being cheaper than the others we got. They even offered to do the work on the spot, but I needed to consult with my wife first.
We called them back on a Saturday, expecting to leave a message, but they answered. They were able to come and do the work within an hour of our call (on Saturday). We called the other companies back to say we went with someone else, and got voicemail for all of them - none were working on Saturday.
After the work was done, they were even able to give us tips on how to do some of the ongoing maintenance ourselves to save from paying someone else to do it.
Go with these guys, trust me.