I don't know the Go-Go so I can't say if the Vamo will be better or worse. Variable voltage and/or wattage is a huge upgrade if you haven't tried it. I have a Halo Triton setup and later bought their twist battery. With changing the voltage, the taste of the juice changes; not like tasting a totally different juice, but it can bring out subtleties, emphasize different things in flavor, make it smoother, harsher, etc.
Variable voltage/wattage devices also have the advantage of regulated voltage. This helps everything stay consistent as the battery runs down. When unregulated batteries get low, flavor, vapor and throat hit all decrease. A regulated device will stay the same then shut down when it's unable to deliver enough voltage. If it was a flashlight, the bulb wouldn't dim when the batteries got low; it simply wouldn't light up.
I just got my Vamo 2 days ago. It's a good deal better than my Triton twist. The main thing I've noticed is consistency. Someone somewhere said a mod will have your juice always taste the best it ever tasted on something like an eGo twist. So far, he's absolutely right. I bought my Vamo mainly because I my other setup suffers from consistency issues; sometimes it's great, other times it's not good at all. I think a lot of that has to with the clearomizers it uses, but that's kind of another topic.
I've also read that the delivery device is more important than the battery. Haven't had the opportunity to compare too many, but I can see how that has merit. I can't use my Halo clearos on my Vamo, and I can use my Evods on my Triton.
But in a nutshell, the Vamo allows you to use pretty much any delivery device out there. It also has variable voltage and wattage. The variable stuff is a huge benefit.
If you've got 18650 and/or 18350 batteries and a charger, the Vamo from FastTech for about $30 (depending on version and finish) is a no-brainer. Especially if you don't have variable voltage/wattage.