I have had mixed experiences with Alex at kontiki. They planted a 25ft Maple for us 2yrs ago and everything went great, the tree looks great and has grown well. This year we contacted them to do some more work in our yard, initially they put in another large tree and mover a lage shed, again everything went well. They were then to put in some interlock and regrade the lawn and plant various smaller trees and shrubs. As spring got underway the project started to slip as they got busier and eventually was rushed and the level of finish was not up the level promised.
I would definitely recommend them for planting mature trees, but my experience of the landscaping was not as positive.