I've got the R32 ARBs. I think I got them for ~£100 including bushes.
I was just looking through a certain parts catalogue one day and noticed the R32 items were the thickest, so I thought I give them a try.
The rear one was very easy to fit, just unbolt and slide forward over the exhaust heat-shield, then to one side and out.
The front one wasn't so easy. The subframe has to be dropped to get the old ARB out and the new one in.
The hardest parts I found were undoing the lower ball joints, due to corrosion on the ends of the bolts. Also getting the bolts that hold the ARB bush clamp to the subframe back on. You need to hold the clamp in place with a pipe wrench or something, close enough so the short bolts reach the subframe.
The old ARBs have a sleave where the bush sits whereas, as far as I can tell, the R32 has not. After >100k miles this sleave had come loose from the original ARB. I guess if the R32 bars shouldn't have this problem.
As for results. There is much less body roll as you would expect. You can corner much harder. Although when pushed to the limit it will understeer.
To combat this I am going to try to drill extra holes on the bar ends, to move the drop link further inward on the bar. There's not much room but I'll give it a go. That should effectively stiffen the rear more, so should dial out some of the understeer.
HTH