I've been using highest shelf for a while now -- over a year. Great service, decent-to-great flower, tasty edibles. Prices can be a bit high, but the service is wonderful. Great communication, usually same-day delivery (I've gotten in it under an hour before!) and within whatever window is quoted. I had a few small issues with flower quality a while back, but they always take care of me on the next delivery and overall the quality has been quite good.
Overall, A++. I don't even think before using Highest Shelf, and it's been quite while since I've even considered a different delivery service.