I used this service to ship some items to the US from Europe. Booking and pickup was very straightforward. I had some issues with DHL in the US (but this is more related to DHL than Sendmybag)

Easy to book online, o LY thing to be aware of is they cannot call a number when they pick up so be sure to have a doorbell. My bag was processed quickly and even arrived one day early

It was my first time using this company and I found it very convenient. Also my luggage was delivered faster than the mentioned time which is plus for me. I liked the app, one can easily check every step, but I also have to mention that one of the legs of my luggage is broken and now a luggage kinda useless because it's problematic to move it.
But overall I liked this company. Thank You=)