I A/B'd my Spider Valve HD100 against my POD Go, and I honestly have to say that the SV held its ground. I also did the same with a Spider Valve 112 combo, and again the same results. Both were going thru the Spider Valve's power section each time, and both had the same results. The POD Go (Helix) does have a great variety of amp models etc.... For many this will instantly set it apart. I get that. Plus the Helix line is still getting software updates, which is awesome. I'm strictly talking about tone for tone. The tones on the POD Go are great, but when going into the SV power section it felt like there was that 10% missing, compared to straight into the Spider Valve. On the POD Go I used the 'preamp' models for this, as the tube power section brought it's own character that did not mesh well with the full amp models. When I plugged back into SV I noticed that not only were the tones just as good, but they felt fuller and had more depth. Looking at it, the SV preamp section has 2 12AX7 preamp tubes, which are bypassed when going directly into the power section. As usual YMMV, but I found that the 10% was all there going directly into the SV. This is just my experience, but definitely a surprising one at that. The head is light, and looks cool. The combo is pretty bland looking in comparison, but is only 10lbs more, 40w tube and has a V30 stock. They definitely deserve more praise than they get.