I've had good response working with professionalequipment. I've bought a few things thru trutech and they are fine, also. My personal experience has been slightly better at proequip. YMMV.
I ended up buying the BW Gas Alert for my personal CO. Seems to work fine and the battery lasts a looong time. I bought the Bacharach Leakator Jr for combustibles; it is *extremely* sensitive, which is both good and bad. I would have liked a few features (the Jr. has no adjustments) but was broke at the time I bought it. Then last year, when the new Bacharach Insight came out, I got one to replace an aging Testo and I love it. Really an excellent tool.
Advanced Home Performance
Hey David, on your Leakator Jr. you know about the "lower sensitivity" mode right? The instructions are on the back and it takes a bit of practice, but I find it very useful. It's my favorite model of combustible gas detector and I've tried a few different brands.
I use a Testo 330-LL, teach with a Testo 325 and wear a Testo 317-3. They are dependable and tough. And I'm close to Sparta, NJ if there's a problem. I also recommend the Testo 510 manometer for portability, but make sure you read the manual and follow the instructions or you will think it's possessed.
Now that I am working for CSG and they supply my equipment I have a combustion analyzer and gas leak detector for sale if you are interested. They have not been used much and are only a year old. Send me a message if you are interested.