i would just plug it into an amp, and the issues with sustain and sound volume go away.
Some ukes are designed to be used with an amp, I suspect this model is one of them. I would recommend against buying it if you like to play in the lounge watching TV with no amplification, the review has identified some issues which would annoy you if thats how you play the uke. BazMaz likes the way he plays his ukes and he writes great reviews, but his reviews are about how he uses his ukes, which seems to be mostly unamplified.
If you are going to play the Hummingbird at a venue with amplification to a large crowd, possibly using a plastic pick, I think it will probably do a lot better than many other ukes in that price range. Today in Australia it is retail at around AU$360.