Apparently , the squeaky space bar can be resolved by lubing it. Some people have also mentioned that it goes away over time. One thing in general about mech keyboards is that you should not let squeak and "ping" bother you too much, since it is likely that there will be a bit of both on a lot of boards. Often it does not really matter if you can keep yourself from going OCD. There have been no other consistent issues that I have heard off, so you can buy safely without expecting the keyboard to ship with some defect. Of course, you can never have a 100% guarantee of these things.
When it comes to "feeling cheap and plasticky" different people have different tolerances for it. There are some keyboards that are fairly popular that do have that plastic almost toy-like look to them. The biggest offenders here are some of the gaming brands that make keyboards, but there are also some other brands that share this look and feel. Then there are also some brands that do have a good build quality and do feel sturdy, but if shiny plastic puts you off, you are better off looking elsewhere.
I have not had the pleasure if trying out the Ducky Shine V2, but I do not feel like the V1 has a cheap or plasticky feel to it. Especially if you opt for some nicer keycaps.
EDIT: Obviously nice keycaps might be an issue with the Ducky shine.