I don't know about the Iolite (I like the Extreme and the Verbalaire) but I would point out to people who don't use them that you feel like you get more "high" off smoking, probably because of CO, CO2, and/or resulting compounds you get that way, in addition to just vaporizing. At first, you might not even feel like it's "working." Most smokers I've introduced, however, say after a few minutes that they "get it," once they realize what the differences are. Some people claim your bud goes farther (perhaps, specifically with the Herbalaire) but I wouldn't know, because I don't smoke.
When choosing a vaporizer, I would avoid any brand that doesn't let you calibrate the heat level (temp knob, etc.) This is because at different altitudes and different humidities, you may want to adjust slightly. Additionally, if the cure of the bud varies, you may wish to vary the temp. Frankly, I've seen cheap vapes that basically burn the material, instead of removing the essentials from it. A good vape temp is around 375 F, and will vary per above parameters. If you get smoke, you're too hot. If it doesn't turn brown, you're not hot enough.
added 2nd paragraph