The Diana 35 is a lovely rifle. (I have two of them, from the 50s and the 70s.). Their problems were:
1. The ball-sear trigger is a bit of a bitch to disassemble (though easy if you know how);
2. In the “power wars” of the 1970s, the Diana 35 lost out to the HW35, FWB 124, BSF 55/60/70, etc.
But if you can bear 1 ft-lb less than the 40+ year old competition, a D35 is a very nice rifle.