Some of the comments on here make me wonder what pepole think an RA is. It is not a GPWS style max energy pull up. Often it they appear to be very subtle manouvers with level changes of only a few hundred feet or indeed a prohibition to climb/descend.
Don't forget if you have an RA there is a very high chance of collision if you do not follow its guidance.
For that RA to then send you onto a collision course with non transponding traffic is highly unlikely during the very brief time the RA lasts.
I would use it all the time.
And for the really low level stuff it auto switches to TA only below about 1000 feet.