Cheap construction, very plastic, but it is easy to use and does its job. Now, whether it will last over time, I don't know. I got it for free through my insurance due to allergies. Maybe in about 6 months, I will ask for another device to compare.

Edit: After a year, it works perfectly and does its job perfectly. Generally, it doesn't have fancy features, etc., but it is very easy to use, in settings, etc. Personally, I have no reason to change it with another one since it has served me well.