Long time lurker, first time poster - this is the first time I've had anything to say. I'm actually pretty impressed with the Plenty, moreso than any of the other 5 (6?) vaporizers that I've owned/had extensive experience with.
Much of what I like has already been said, so I'll spare the details on those points - it produces an incredible amount of vapor per hit, and has a massive bowl size, both pluses in my book. I like the design for a home vape more than the tower-like models (SSV-like) because I hate passing a hose around with a small group - bowls tend to slide out and spill everywhere, and hoses don't reach far enough in my experience.
But there are a few things that I personally like about the Plenty that I don't think have been addressed that much in this thread.
I have to disagree with posters here about the steel coil. I think that it does a much better job of cooling off the vapor than silicone tubing, especially foot per foot - I dunno how anyone could think ~2.5 feet of silicone tubing will cool anything effectively. It definitely does not cool the vapor as well as water filtration, and the vapor a little bit warm, but it's the coolest of any vape I've tried that lacked water cooling. One strong sign to me that the vapor is being cooled, aside from subjective taste, is that the steel coil gets pretty damn hot, and when you pull directly from the vape without the coil (you can use silicone tubing instead of the coil if you prefer, this is how I vape in a car) the vapor is much, much hotter.
As far as vapor quality goes, I think it is as good as any vape. I honestly think sometimes with my friends that they think the vapor quality isn't as good because there isn't glass in the vapor path, and that this is causing them to be biased when evaluating the Plenty. I guess I'm not a connoisseur of vapor quality/can't really tell the difference at subtle levels, but I really think that the vapor quality is at least average. One thing I've always liked about the volcano, and now the plenty, is that the design prevents you from overheating to the point of combustion. I've gotten some damn brown abv with the Plenty, but it never burns, a huge plus in my book.
I also think that the harsh vapor is a byproduct of using the vaporizer incorrectly. I have found that if I turn the vape up to 6 or 7 from the beginning, the vapor is too thick and too harsh. However, at 5, I can barely taste anything at all, and yet I can blow out lots of thick, visible vapor. Once the hits start to thin out, only then do I raise the temp to 6, and repeat until 7. I've found this method to be the best compromise between smoothness and thickness.
Which leads me to my biggest problem with the Plenty - it's a quirky piece. When used correctly, I've found it to be excellent. However, you have to hit it a specific way, and it's not intuitive especially for my friends who don't have as much experience with it as I do. For one, the draw has a lot more resistance than other vapes, so instead of focusing on slow, dense hits as with the Launch Box, SSV, or similar vape, you have to hit it a little faster to get all of the vapor. You also have to wait and hit the vape at the proper temperature, which is a hassle since it varies so much.
Anyway, this post has rambled on for long enough. The Plenty definitely has a number of flaws, but reading the comments here I think it's gotten a bad rap for what it is. It may not be as efficient as other vapes, but it's pretty damn close (and for people that don't think it's efficient - have you been using the liquid pad?). The taste might not be as pure as an all-glass path, but it's pretty damn close. However, most vapes don't even come close to how much vapor this puts out/how much of an effect I feel after this vape vs. any others, and I don't think any vape on the market is as sturdy. Hopefully some of this is helpful for people who aren't liking the Plenty - maybe try hitting it differently? As always YMMV, and opinions are subjective, but the criticisms that it has received just don't match my experience with the device.
on a lot of products if they were less expensive and more versatile. 
... Maybe the fact SM uses it on the highest temp makes a difference i don't know...
