Re: the MFLB. It's like riding a horse as opposed to a carriage, or even an automobile. That said, a horse doesn't require much, if you can hold the reins and keep it from bolting, and it's a very simple and compact vape. I have one, don't use it much.
I would not replace any vape with another, as they have different virtues. A Solo is probably the most simple to operate, and will vape from low to mid-high temps, has quite good flavor at the lower temps, but it's not stealthy. The Pax cooks the herb continuously, and doesn't have fantastic flavor. But it's the most stealthy. The FireFly takes some getting used to, runs a little cooler, but has the best flavor. It's moderately stealthy, sits between the Pax and the Solo. It looks more like an expensive lighter or phone, so it can be tried in public in a pinch, I do it, but then again I'm certified CA Medical. But because of that, I nibble it in public all the time, and I can tell you people don't pay attention to the FireFly, it looks like something that belongs in your hand, like an expensive something, chrome trim, lovely metallic dark grey paint job, and the vapor can be kept subtle with a little technique on the button and the drag. The Pax is smaller and easier to conceal, but the vapor seems harder to regulate because the oven is ON.
Oh, one more thing. Economy.
A MFLB, in the hands of a seasoned user, can be very economical, but also can waste herb if you aren't. The herb needs to be very finely ground.
The Pax almost demands a full oven to work well, so for a light vaper it wastes herb.
The Solo can be quite economical if you add a little spacer screen in the glass stem so you can pack finely ground herb just in the tip. A minimum load might be 0.1g. Fine grind is best on the Solo as well, but not as critical as on the MFLB.
The FireFly is a natural with tiny pinches, say even 0.05g. No need for fine grinding or an additional screen, no need to mess with the bottom screen. Just roughly shred the herb by fingers, close the lid and then let it fly around in the bowl as you vape. The vapor is coolest and tastiest on the FF, as the vapor is cooled in the two stainless steel channels under the lid. Clever design.
As a shared device the MFLB is usable but tricky. Not very practical.
The FireFly doesn't share well at all, even if you load 0.2g, because you regulate it intuitively for yourself.
The Pax can be shared in a pinch, YMMV.
The Solo rules for easy group zonk.