We used SML for both the loading and unloading of our move. The loading went well. The workers called to confirm their arrival time, they were prompt and very polite, and worked really hard to get the truck loaded! (We had staged the boxes in the garage, so they were able to work fast. They got the furniture from the house and finished up super quick)
We were able to leave 1/2 day ahead of schedule, and called the office at 8am to reschedule the unloading. The woman at the office told me multiple times that she could not confirm the change, and I asked her to call back when she had a response from the SML team onsite. We waited all day for a call to confirm, and didn't hear anything until we got an email the following morning.
Once again the workers who unloaded our truck were great, called to let us know their arrival time, were polity and worked fast.

Overall I'd recommend SML on the strength of their movers -- the back office team however didn't handle our change well.