I'll answer my own question smile

There is a difference in design and how they are assembled..even though they may both be plastic..I would think there are better quality components..

Also comparing the difference in the Roland line...there is a difference between say an E60 and a E80..you can hear the difference in the samples and output..Not just weight..I would also suggest the added weight must be the design factor and quality componets in the E80 that are not in the E60...They are both 61 keys with speakers ....why nearly twice the weight? It has to factor in..

I would suggest comparing the PS910 to the Tyros model..may be similar differences as my Roland example...Think about it? smile
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