There are a lot of 'better quality' vape pens to pick from. A long time, respected source is Vapor Brothers, the Dabbler being an example. New on the scene, and IMO worth considering are the Linx Hypnos and Yocan Evolve. I've been using them and have yet to find reason not to recommend either as well with the understanding that being new they could be problematic later (like battery problems, early cart failures, etc.). But thus far they look like solidly engineered well built dedicated attempts. Not some lame cobble up of e-cig parts.
But none of them is an industry standout like Volcano.
For that you'll have to 'expand the definitions' a bit, just as Volcano did? There I agree with the Divine Tribe recommendation above. The (glazed) ceramic doughnut is indeed 'the hot thing' it seems. This means no exposed anything but glass really. No metal, no wick of any sort. Super clean. DT makes history here, I think, because they're using the best possible construction and materials (lots of lesser attempts at the same sort of stuff around). Secondly they were not 'cramped' in the pen format, their atty is 20mm (small e-cig tank size). When put on top of a couple of the smallest Temperature Controlled 'Mods' they are very compact, allow for TEMPERATURE REGULATION at the load (no way you can 'burn the oil' if you set it up right, it's protected), very easy cleaning, low cost, and 'the best taste possible'. I'd check it out. Right now you can get the latest model atty and mod to drive it with for $50 (shipped), link below:
http://fuckcombustion.com/threads/divine-tribe-attys.14455/page-50#post-959702
That mod, while it won't do Temperature Control, still gives excellent service in Variable Power mode (at about 11 or 12 Watts) but then, like a normal oil pen, burning oil is possible if the performance is high enough to be really practical. You have to pay attention to what you're doing.......
The 'best pen vape ever' goes to Cera EO hands down. It's big, an inch in diameter, but holds up to a gram an dishes it out like you wouldn't believe if call on. Easily capable of 1/20 gram hits ('small dabs'?) as fast as you can suck them up (I can't even come close personally, it's like owning a Lamborghini as a personal car.....and Jay Leno I ain't). Bad side is they are no more, and you don't find guys willing to sell 'em. It's little brothers are 'pen vape' size. But Revolution/DART is no more as well. I still have a couple I save for 'special times'. Too bad the company crashed and burned for many of the traditional reasons but the big loss is those products are no more.
But today, we have the DT 2.5 and 2.7s (different mouthpieces) in two depths for the bowl (same heater). Great stuff, much better IMO than the rest. Couple that with any of the 'about $40' TC mods (there are several to pick from identified) and maybe $10 more for a High Performance 18650 if you don't have one and you're good to go. And go. And go and grin, and grin, and......
OF