I feel the FX8 is still the better product based upon what the VP4 offers.
I was hoping for more effects and footswitches plus I suspect it will have tone suck/coloration even though it will be an effects only unit.
I was watching a few videos and I believe that I could hear the tone suck (or tone coloration) by the effects.
The FX8 is the only Fractal device where I didn't get any tone suck/coloration and where it felt the same to my fingers with the effects in the loop or no effects in the loop of the amp.
After taxes and shipping, it would be close to $800 for me so I don't see myself buying one until a friend gets one and I can compare it to the FX8.
If there is no tone suck/coloration, then I would determine if I could live with just 4 effects.
For me, I really need a preset with variations of a NG, Compressor, Wah, EQ1, then Pitch, Chorus, Delay1, Delay 2, Reverb, and EQ2.
I'm able to get pretty close to this list with an FX8.
I was hoping Fractal was going to come up with something a lot better than the FX8 and I don't believe they did it with the VP4.