Bought a couple of kits after some concerns with my basement. There are a couple things worth mentioning. The bacteria and mold tests are pretty worthless, you can get those at most local stores for under $10. Second, the gas tests need exactly 10 hours of exposure to be read. Third, the instructions on how to read the results that came in the package were unclear, and apparently not quite correct. The PDF available at testcountry.com was better. There are only a few subtle differences, but those are important. Pay VERY close attention to what the tubes look like beforehand, especially in the area/strip where color change will appear. I'd recommend taking a few digital pictures just to remind yourself. In some cases the change can be very slight and you'll be wondering if thats what it looked like originally.
Pros:
Relatively cheap. Lab based tests are going to be in the $200-500 range.
No waiting for lab results.
Cons:
Compared with the lab based tests I used, accuracy is a low.
Instructions are poor.
Did I mention the 10 hour timer is critical? Don't forget to check it on time.
Mold test isn't necessary.
For a quick and easy test for a few common gases, its not a bad deal.