I just purchased a 500x this past weekend, and I have owned the 500 since it's release. So the X sounds exactly the same you just can work it more because of the extra processing. I am selling my old 500 to a friend and for him where he does not use a lot of complicated setups as neither does another friend of mine; upgrading is not really going to give them a lot.
But for me I usually have a couple of patches that require a lot of effects, that I now can do with the 500x. The example would be I now have a patch with a screamer -> split pitch glides (one +12 the other -12) -> Amp -> 2 delays -> to Spring Reverb. That was never possible before, but now it is.
The only other noticeable change is the footswitches. I do like the circle of light round the switches, but they feel the same to me and sound the same.
If you got the 500 for 400$ and these changes are worth 100$ then go for it. If you got the 500 and you paid 500$ I would exchange it. You should have 2 weeks or 30 days I can't remember.
I bought an HD500 at GuitarCenter tonight. I was super excited to get it home and play with it, but when I went to register it I realized that Line6 is releasing the HD500x. Very frustrating!
Does anyone know what exactly the difference is? I'm not usually the guy that has to have the newest of everything, but the quality of the models seems to improve by leaps and bounds each time there's a new product. I guess that's the point, but I'd like the best possible tone for my money.
Any help/info would be appreciated...especially from Line6 employees.