The only "thing" to "look" out for on the (mostly early) IVs is that there's a brown cap that likes to blow up & make a mess of things.
I owned an A pre band. HATED R2. Sold it. Played a B at a GC & liked it much better- darker & tighter. Bought a B last week to try it in the band, want to see if it can succeed where IIC+ and III have failed!