I have two street cars with solid roller cams and so far I think they are great. The stock stroke 440 I have has almost 2000 street miles on it I have checked the lash two times and nothing has moved but I did break a Erson 1.6 roller rocker at an idle at a stop light.
The other motor is a 408 W2 headed SB, this motor has over 2600 miles on it the lifters where checked a 100 miles ago and they look great and they are Comp lifters. I drive the small block everywhere, back and forth to work- 24 mile round trip round trip to Vegas all around the valley. I will be doing DragWeek this year with the car plus Iam thinking very hard about running the car in a true street challenge race next month in Pomona California.
Now my personal opinion on using a roller cam is you need to use very good valve springs, rockerarms and good pushrods you do not want to have any thing flexing in there.