I've owned & used the v2.0, XT (bean & Live), the HD500x, and now the POD Go, must admit, that although the POD Go is "limited" in the number of effects you can have, the quality surpasses the HD, and that was seriously good (if underrated).
Although the XT had loads of amp & cab sims, I found the effects to be a bit lacking. OK, there weren't many dedicated bass amp & cab sims on the HD, even with the HD Bass pack, but they were really good (better than the XT's IMO), and the effects were good too. Nothing bass-specific, but all the ones I wanted worked well and sounded good.
I did find that the POD Go needed a lot more tweaking to find a good sound, over the XT & HD's "plug & play" approach, but the core sounds are there. With the limitations of the POD Go, there are a few little work-arounds that you need to figure out, such as I like a touch of reverb, but with the effects added, I didn't have a free block for a reverb... Work-around, use a high number in the "Early reflections" in the Cab settings. Another one is to definitely go through the "Mic" options, as some are underwhelming, but some sound superb.
Really pleased with the POD Go.