IF they are competent. I have had two bikes shipped to me that were supposedly packed by a "professional" at an LBS. One was a total joke, the second they didn't put anything in the drop outs or bridge the box to protect against crushing, in both cases the bikes were damaged to the point that they were unusable. I have several other bikes shipped by individuals that were packed much better because they took the time to do it right.

Unfortunately it is a crap shoot. FWIW I ship FedEx and cut the boxes down to just under the size they start gouging at, however that only works on bikes under a certain size.

Aaron