Take reviews from US site. 'adjust' them for price/ performance ratio on personal scale. Just like SVS products. 
The reviews would shed some light on their relative performance.  No direct comparison due to price difference.
Give and taken. Personal judgement would come into play when making buying decision since reviews in Malaysia market are pretty limited.
Taukeh, you agree with me or not? Peasant like me does this kind of comparison most of the time.