It is only significant if there is an increase in demand for the Tyros five keyboard as a result of the offering of 76 keys as opposed to just the normal offering of 61 keys. If the same numbers of tyros keyboards are purchased ,Yamaha won't have gained anything by offering two models . Time will tell though . We will only know if it has truly been a success when Tyros six is produced and if they offer that also as a 76 key model. I would suggest that some smart person at Yamaha has seen an opportunity because Roland no longer produce high-end 76 key ranges and that their client base would be left wanting a 76 key offering that was top of the range