RB 440 - Roller Rockers

Looking to find out about Roller rockers, these will be for a mild 440.

I only have experience of Jesel, T&D, etc from when in had my B1.

What brand do you guys run, recommend or ones to avoid.

Thinking of some these listed below, in no order of preference
a) 440 Source
b) Harland Sharp
c) Crane
d) Yella Terra

Cheers,
Mark . . .

On a mild 440 thats a waste of money.Just use some iron rockers.Was going to change mine to rollers but my radical 440 runs well with them so why spend the money.Rocky

Or B) harland sharp.