Well, I think most PBT keys look fine...but spacebars are a different beast when it comes to PBT...I mean, the stock set isn't ABS because they just decided to do something funny....I'm sure it had to do with the number of rejects and issues..they just couldn't produce what they needed to with the consistency they wanted...
Even having to rebend my pbt spacebars, I still think they're great and prefer them a LOT more than the ABS ones..so much so I'm not sure I could even go back to the ABS ones...