I cannot speak for the 57 sounds but previous experience with SWD sounds says the actual sound quality is very good but with the proviso that they suffer from lag. Howes sounds respond promptly to throttle changes where the SWD ones force you to drive to the sounds. I have owned SWD (or Bachmann's own variations on SWD ones) in classes 20, 24, 37, 47, 52 and 66 and driven friends' classes 25 and 45 and this applied to most of them, with the 25 and 66 being the most responsive and the 24 and 52 probably the slowest for the sounds to respond to throttle changes.
I had the 20, 24 and 52 reblown by Howes! I also had the 66 reblown although the Bachmann/SWD package was not bad.
Here is the video I took farly recently of the Howes 57 - sorry about the shaky camera work though.
MP4 format: