6SN7 Tung Sol Reissue Mullard 12AX7 any comments?

Does anybody have any experience with re-issue Tung SOl 6SN7's??
How about re issued Mullards 12AX7's.
They're being copied to the smallest details (they say) or the opriginals in original Reflektor Plant in russia.
Just wantd to now If I should stop looking to spend small fortunes on NOS.
Are these guys a solution??
KT-88 GEC being copied also Golden Lions, any thoughts.
I headrd the guys at Sophia ELEctrric (famous for their 300B tube) are bringing form Shuguang a copy of teh GEC that kiks butt . .. .
I'm using their awesome KT-88-98 and like it very much so. . . the promise of something even better is very appealing to me, especially when looking at original GEC tubes beaten to a pulp by MacIntosh amplifiers for sale for many hundreds of buck sometimes even K$ . . .
Your thoughts are appreciated.
Wanted to give you a heads up on the new generation of chinese amplifiers tubed they are a fantastic value at their current prices, just make sure use them with a variac adn to 110 VOLts otherwise tube plate voltage is too high and destroys tubes in months.
my grid here is 119 to 124 volts and that is too much for these amps.

Thanks for the help;
God Bless!

Gonzalo