No Regrets at all, I tried a GS4 a few years back and didn't like it too uncomfortable, the GS5 is a different beast, very comfy with a small 10mm piece of foam added under the base seat cover and I have it paired with an SFX-100 system and a mini LFE for RPM. If I forget to power it up I wonder what is missing when I drive, then when I switch it on its a revelation again. It is a big investment though, but having owned a NLR V3 I am probably tempted to say this may just pip it at the post as a stand alone.