I purchased the NG Digital Vaporizer about a month ago. Too bad that you have to figure everything out for yourself, and research the web to find out all you need to enjoy this actually very good Vaporizer. I think the Digital model is the only way to go. The reason that I vaporize is to make the experience healthier, and enjoy the same lifestyle. So the Digital readout is essential to get mostly tasty vapor not smoke, thin gray vapor, as opposed to white smoke. If you look on the web anywhere from 330F to 375F with 365F seeming to be the most popular. At higher temperatures you are getting more carcinagens and stuff that makes you fall asleep etc. etc. You want to put the whip into the unit while it is heating up so you can see that you have your temp set to 365F. I now have mine set between 10 and 11 on a clock. Probably closer to 11.
That is why you always want to heat the unit up with the whip inserted into it. Then to clean the unit, they say every 3 to 4 months to change the tubing. I bought 20 feet of Silicon Tubing, 3/8" ID, 1/2"OD, 1/16" thick wall, from US Plastics online. Now to change the tubing be very careful because the handset and the mouthpiece are glass! Do not pull on the glass Get one of those razors at Lowes that looks sort of like a pen, and you slide the cutting part out. For the handset and the mouthpiece, cut the old tubing out 1 inch past where the glass ends very gently, and slice the tubing remaining on the handset and mouthpiece very gently with the razor. There's ways of cleaning the handset and mouthpiece all over the net, saving the honey etc.
Putting in the screen: The key is the three prongs of glass on the bottom of the bowl. The bowl is the 1/2" area below the frosted looking glass tip. Slightly bend the screen so you can put it in sideways into the bowl. Then use the stir stick to guide the first haf of the screen down to the bottom so those three prongs can hold it from falling through, then push the other end of the screen to the bottom. When the screen is set into the bowl correctly it should form a well.
So I like this Vaporizer for the money. I like the fan assist, and it heats up in no time and can get very hot if you wanted it to.