Ichiba's have had issues with vibration at higher speeds and clearance of the wheel by the factory studs coming thru the 20mm spacer.
H&R spacers are hub centric aircraft grade aluminum, come with replacement studs and are a snap to install for a perfect fit. Only 5 nuts to tighten versus ten. THAT is a concern too. I like to check my lug nuts regularly and you would have to remove your wheels to check the inner spacer nuts...
Lot's of DIY articles too. I wrote one for Stillen and it is posted in their blog with pictures and a step by step how-to. Ask for Josh at Stillen. He's the man!
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