I have two of them, a Bulgarian 1903-contract Rifle converted to 8x56R30M and a civilian-proofed 1917 Carbine in the original 8x50R.
The actions are fast, loading is quick and positive, unloading the same.
The Austro-Hungarian Empire got good service out of them in the Great War, as did Bulgaria in that war as well as both Balkan Wars preceding it. The (many) successor states also got good service out of them and they stayed in usage until the end of World War Two.
The only "issue" that I know of regarded a fall-off in accuracy with the Rifle when the barrel was overheated. This was due to the very lightweight barrel used on all of these, combined with the continued reliance on conventional stocking-up. Had they been stocked as was the SMLE, I am sure that this issue could have been laid to rest as well.
As SHOOTING rifles, EVERYTHING depends on your ammunition. With fresh, consistent loads, on average, there is no reason that one of these should not be able to keep up with any other rifle in its class. We are fortunate that Trade-Ex has the Brass and that loaded ammunition will be available soon everywhere that cares (and is available in a few places right now). That takes care of the 8x56R30M. For the 8x50R you need a .323 bullet; brass can be made by resizing and trimming 7.62x54R Russian. Loading data is in COTW-6 and up.
But MY opinion matters little.
The opinion which MATTERED was that of His Imperial Majesty Kaiser Franz Josef I. After all, he paid for them.
And he liked them.