So many believe that CW decoders are their answers. They're not!? I've been doing morse since 1970 and have seen and played with a few decoders. No matter how well they work they can't help the operator who is sending the code who run their letters together bad spacing etc or likely deal with the static crashes signal fading. That said the decoder on my SBITX is par and I like when it doesn't know it puts the .... or the ----- in so you can guess. If you want to give it a fair chance tune in W1AW code practice since it is computer generated its spacing and speed spelling are all spot on. Plus the transmitt on several? bands so you can always find a strong one.
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Patrick?