Hi Guys
Fran,I know exactly what you mean.

I've actually still got my PA800, the styles I'm referring to are actually the factory style for the pa800 vs the factory style for the pa3x. A lot of the styles that are on the PA800 are also on the PA3X , except that they now have 4 fills instead of the 2. I'm just saying that somehow, they sound better.

Couldn't help myself, just had to check a couple.

Easy Pop 1
New Wurly Amp chorus Piano instead of Syn Piano X. They used different DrumKits & Bass. JazzKit RX2,Standard Kit RX4. They've used a different bass Slap Finger Bass RX ( RX sounds are Velocity Sensative, ie similar to Yamaha's mega sounds.ie Bass hit at different velocity it produces a different type of sound or a sound effect) Real String2 instead of a simple GM string.
They've changed some of the sounds in the above style & they've also used a couple of brand new ones, that's why I suppose I thought it sounded better than the PA800 version.

A couple of the other styles they've replaced normal sounds with DNC sounds.

I'm not sure the if the PA500 has the RX & DNC voices?? if it doesn't, be the equivalent of my PSR1500 ( no mega sounds) vs the T1 ? or maybe even the T2.

I personally was very happy with my psr1500, at the time I didn't want to spend the extra buying a T series, I didn't know whether it would be the right brand for me. It wasn't, but the korg is , so I'm happy spending the extra money.