I'm new to vapourising and got my herbalaire about two weeks ago after looking around at various reviews and forums. So far I'm happy with its performance. Due to my sensitive throat I wanted a bag type vapouriser, so I also considered getting the Extreme. However there were reports of problems with it, inaccurate temperature readout, and to me it's a bit "over-featured". Also, the herbalaire was cheaper.
I would definitely say I am a herbalaire fan because I think it is a very clever design. I like the look of it, its small size, and the red lighting (why is everything blue these days?). Keeping the pump separate is a good idea, as it is easily replaceable. I didn't like the cheap plastic tubing that came with it which was also too short. I bought some longer silicone tubing and now I can leave the pump on the floor while the herbalaire sits on my desk. The bags seem ok and they are big enough for my purposes. Some kind of valve or stopper would have been a plus. A long mouthpiece extension was included with the kit, but I still find the direct inhale method too hot and irritating, and I didn't like its narrowness. I was thinking of getting a length of silicone tubing to fit over the large main mouthpiece to see if I can handle direct inhalation. The funny thing is that the main mouthpiece is shaped like it should accept a tube over it, but it's not mentioned anywhere.
The temperature control is good, and I've had fun dialling up different temperatures to get different fractions of the active chemicals. This has really changed my perspective on the potential of vapourising. The one thing that I really like about the herbalaire is the way I can just rip off some bud, throw it in, and bake it till its done. I don't need to grind it or prod it and stir it half way through. The exhausted bud just crumbles to dust between my fingers. I really get the sense that the vapouriser has thoroughly extracted everything useful from the bud.
The only thing that seems slightly awkward is shaking out the crucible. Also it would have been nice if a spare crucible was included in the kit, as they are very flimsy (and probably cost next to nothing to produce), and without it you can't operate the vapouriser. Otherwise I would need to buy a set of five and pay for international postage.
I'm also curious about the Purple Days (which looks like a great design), but I'm not sure if it would be too hot for my throat.