I like answering Qs on GIS-SE. I am from an Esri background, and therefore tend to stick to the Esri related Qs.
At the same time, I have dabbled with OpenSource, and read a lot of the OpenSource Qs to gain better understanding about them.
I am associated with an Esri Distributor, and every now and then, I think that a particular product is worth mentioning in an answer, but a product that I am associated with.
They are my genuine feelings on an answer, but I am not sure if I am crossing any lines here?
For the record - I work in a technical role, and do not get any sort of recognition relating to sales or even posting positive material about the product online.