Hey Psy
Unfortunately I haven't used a Pax before :/
This is a summary of what I know though:
A solid conduction vaporiser, although frowned upon by some (because some see Pax as the Apple of the vaporiser world).
The benefits of a conduction vape are that if you're coming from smoking, the transition can be somewhat easier. The Arizer vapes, for example, are convection vapes and can sometimes be a bit of a let down for those who are trying out a vape for the first time. Especially for those who smoke regularly and are used to that harsher feel on the throat. I've found that the Arizer vapes have more of a subtle feel when you're using them. Don't get me wrong they'll still get you HIGH AS FUCK, but some people prefer that harsher throat feel.
With conduction, you lose out on a flavour, and you have to pack it down so that it can function at it's full potential (and that's why a lot of people tend to recommend the half-pack lids, because for a vape it can be a bit of a bud hog). But, you get big clouds. The convection vapes you don't need to pack them; literally just suck up some bud like you're using a straw, and you're good to go.
But the benefits of Pax is that you shouldn't have any problems with parts or accessories (especially for us Saffers), so that's always something to keep in mind.
I can't speak on behalf of the battery life.
I have also heard that it can start to get a bit smelly. So, if that matters to you, then you might want to consider how often you'll be willing to clean it out properly.
The Pax is probably the most discreet vape you can find (that I can think of at the moment anyway).
But if you're looking for something similar.... you could also look at the Arizer Argo, Boundless CF/CFX/Tera (although the CFX and Tera are a bit on the large side, but make up for it in terms of battery life), or maybe one of the DaVinci vapes.
If you're on a budget though, I really can't recommend the Dynavap enough. The M goes for about...R1500 at the moment? And yeah the torch thing (USE A BLOW TORCH LIGHTER) can be a bit of a bitch at times, but it really does perform rather phenomenally for what it is. You can go from huge bong size hits, to light tasty ones. It also uses fuck all bud, which is always a plus. But I wouldn't use it in a group session (unless it's only 2 people).
I think this is probably the most relevant point though. You enjoyed using the Pax. So, you can't go wrong basically.
BUT! Variety is the spice of life. Maybe something different that you haven't tried before would be even better? I dunna... Just a thought.
Anyway, hope this helps. Apologies for the essay, I got carried away again.
TL;DR: Figure out how you're going to be using your vape. Is it going to only be you? Are you going to be smoking at home, or more when you're out and about? Does flavour and saving bud matter to you? Is battery life something you need to take into consideration? Will it be used with a water pipe?
EDIT: Should maybe look at starting a general vape thread
EDIT 2: New thread here for anyone interested: