Considering that on some cars, the spring simply sits in an indentation in the control arm itself, there is not really much rotational movement there.
In order to test available parts, I have had two different sets of roller perches on my car.  The first pair was removed immediately after installation as the design did not allow for access to install the shock bolts and the washers for the lower shock mounts were forced hard against the control arm, negating any effect of the rubber washers being able to move. They also did not have clearance to get a socket on the nuts.

The second set from a named supplier cured those ills. They are still on the car.

Bottom line:  I cannot really tell any ride difference from the stockers.  I am leaving them on for long-term testing.  I do have a gut feeling they will last longer than rhe rubber ones.

I've not noticed any difference at all with mine.  As Steve says, there isn't that much rotational movement and I'd always thought that the greater resistance to rotation of the stock pieces might actually be desireable for keeping the ends of the springs in place as they compress and decompress.  But I'm not a suspension expert.

I bought the spring perch listed as "Heavy Duty" that are now about $30 each. By 6000 miles, the insulators was shot and both were clanking. 
Installed rollerized perches after that. There can be some truth to the front end rising a little more now.... I've been trying to figure out other things and haven't paid that much attention to them. 

Bolted to Floor wrote:

....... some truth to the front end rising a little more  . 

Hey-Hey-Hey-Hey.......SOME TRUTH??!!.....  Com'on Man!
My little "snowflake-millennial" feeeel'ins are hurt!!
Naaaaaaaaaaa..knot reelly
With  that hot-rod stroker Big Block of yours... wheel stands are definitely in the realm of possibilities sooo
........of course you wouldn't notice much rise !
6sal6