I am using this as a homeowner/novice and find this unit to be more than adequate for my needs and a step-up from the hot/cold temperature guns (which also work very well), especially at this price point. I got it initially for locating cold air infiltrations in my home but have expanded its uses to include finding leaking duct work in the HVAC system, gaps in insulation and water damage/water leaks. Used correctly, thermal imagers such as this one can provide a ton of information. You will be able to "see" where studs are in your walls. You will be able to "see" where your ducts and pipes run behind walls - and will be able to "see" any leaks in your ducts and any gaps in your insulation. You can also scan your home, especially around windows and plumbing fixtures for existing or previous water damage that is invisible to the naked eye. There is just so much that you can do with this thing and so many things that you can discover that you would never know just by looking.
Yes, I cheaped out and got the version without the second camera, used to overlay actual surroundings with the thermal. I have not found that missing feature to be a hindrance. The image could be clearer but for my basic uses and the price point I find this to be a great value.
Bob V 
Justin 
