As Fozzer said, there are some things that you can only get payware (Radar Contact V3 has no freeware equivalent that I'm aware of, certainly not of the same standard anyway).
That aside, I agree with orenada635's original comments.
The quality of freeware these days is often exceptionally high. The Falcon 50 by Yannick (sorry Yannick - I've forgotten your surname

) is one of the first examples I can ever remember of a freeware aircraft that beat the pants off
anything freeware or payware about at the time.
The Meljet series, The recently released outstanding Gazelle helicopter, David Brice's imminent Eurofighter Typhoon. These are all examples of freeware that I personally think just can't be beaten.
Looking at the same side of the coin, but from a different perspective, you can also get caught out with
some payware. If you're ever bored, take a trip to Abacus's site and download one or two of their free trials (For God's sake don't buy any of their aircraft until you've tried them first.)
I've nothing personal against Abacus beyond the fact that most of their so-called FS2002 aircraft are nothing of the kind. Not everything there is bad, but I'll bet my P.C. that there's nothing in the way of payware aircraft up there that you can't find a better freeware equivalent of. As I've said before, it's to their credit that they allow a trial first.
Most payware companies don't. You buy it, and then, if you're unlucky, you discover it's no where near as good as you expected, by which time it's too late.
If you're going to go payware, search the forums first is my advice. Get opinions from people who already have the product you're looking for, and ask about the support, updates, and after-sales service in general.