Solid lifter edm's

Just picking brains here about the pro's and cons of solid lifter edms,what are the advantages or disadvantages to using them,are they worth the effort? To me in my mind seemed like a good idea and better oiling on the cam but I dont know much about them,so who has used them and opinions from those who have and their thoughts..the application will be a bblk street car..thanks to all in advance............................KEN