The thing is, if a person has read up on any particular software and understands any drawbacks there may be, then decides to install it, that's fine.
If that person then runs the software and has no problems with it at all, then that is also very good.
The thread in this forum at;
seems to point to some issues with Incredimail, but in the same thread there are many people who say as you do, that they like the program and have had no problems with it.
It nearly always comes down to personal choice, and if you are satisfied with the program and the way it interacts with your computer, that's good.
I've used Incredimail ever since it came out. Frankly I like it period. Its head and shoulders better than any other email program around. In fact, it only took me a couple of times using it to decide to bite the bullet and pay for it. I don't know of any spyware issues rergarding IM.