We have had Heartwood provide pruning service twice now. No problems whatsoever. In the 3 years between prunings, we have seen some neighbors use other tree services. They have had disappointed due to slow and messy work.
personally, I like Heartwood because they are on time, on budget and they know what they are talking about and what they are doing. The security of knowing that a job will be done correctly and on time by competent people is always the best choice and the best value.