I bought a little used one of these in 243 a few years ago. Very happy with it tbh, problems so far are nil, excellent accuracy and very solid. I replaced the synthetic stock with a laminate (mainly as Im not particularly keen on synthetics), I may get round to bedding the action and replacing the trigger at some point but only for something to fiddle with, not at all necessary or affecting accuracy.
in terms of idiosyncrasies - I played around with different bullet weights, initially trying a 100gn bullet, then various 95s. I was never happy with the accuracy of any of them really. Then tried 85gn sierra BTHP and Varget and found the sweet spot with very tight touching groups. I now use 87gn vmax as the 243 is mainly used for fox control but it seems a very accurate rifle with bullets under 90 gns. Obviously this is only relevant to my rifle, yours may be different but its something to think about.
bottom line is you wont go wrong with a 595, once you've found a good load its a solid dependable rifle that'll give years of quality service, enjoy!