Big difference between a GW-7 and an E-09. I have not played the Yamaha in question, so I cannot speak to it. But, the E-09 is not worth $500 IMHO. I bought a new one on ebay. The keys are small and light. The sounds are very good and the rhythms are not bad. My complaint is mostly with the fact that sounds and rhythms are accessible numerically and only one item onscreen at a time. That means you must either have a list on hand or know the sound or rhythm - way too much trouble if playing at the same time. If you've ever played a more advanced arranger, you will not be satisfied with the E-09. If this is your first foray into the arranger market, you'll like the sounds and rhythms. My suggestion is to spend an extra $100 and get a used PSR 2000, 2100 or 3000. Look for a good deal on one of these and you'll be much happier and won't be looking to upgrade in three months. Good luck.