Bit of an update:
Both of my Solo II's carked it - it may or may not have had something to do with rosin in non-rosin vapes, but hey, these things happen.
I had just ordered an XQ2, which is pretty much the same as my old V Tower, but a bit flasher. It goes alright, but I missed my Solo's, but i have now flogged 3 of them .
Just got a Mighty, which I had resisted getting for ages despite hearing it was the best, and after using the Plenty and not really rating it. Well, I just have to say, the Mighty is the best vaporiser I have ever used - ever. Better than any desktop or portable by far. Some annoying little indiosyncracies, but just exceptional flavour and build.