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Has anyone had any experience .... good or bad with Comp big block hydraulic roller lifters part no. 8921-16? I'm converting to these and Comp cam after using the old Mopar 284º .528 solid cam for several years. Just want to hear of any failures or good term results.

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Thanks for the replies, guys.
Anyone have anything good to say?
I've driven this engine over 37,000 miles and shifted hundreds of times at 7200 RPM with no problems using the old Mopar cam, but now I have an overdrive trans and spend most of the time around 1800-2100 RPM, so want to build bottom end torque and not care so much about the big top end. 99% of my driving is daily trips and highway cruising (it still runs 12.6's) but I'm tired of the solid lifter clatter and lack of low end grunt.
I'm hoping to hear from someone who has used these parts, XR274HR-10 cam and matching lifters and put a decent amount of miles on them.
Built my first Mopar hot rod in 1960, so have a bit of experience with building these engines.