I honestly cannot tell any difference. I have the driver and the game updated and tried different configs to see if anything changed at all, but numbers on screen are pretty much the same.
It's going to vary a ton player by player and config by config. Reflex helps the most when you reach what we typically call a "GPU Bound" state. GPU bound is when your GPU "falls behind" your CPU. I have a GTX 1080 Ti at home and I still hit GPU bound scenarios because I play at 4K resolution with all my graphics settings cranked to max.
The important thing to note is that reflex will never increase your framerate. It's only impacting input latency. If you have the driver, there are also new settings in Video->STATS where you can turn on graphs for input latency caused by the GPU/CPU.
Some players may see little to no gain, for some players it will be night and day. If you have a higher end GPU you might try out boost as well but note that this will keep your GPU at max power usage so it's a tradeoff.
In general, I'd recommend all players leave reflex on. It can't hurt and there may be game scenarios where it can help smooth out input latency (e.g. ...
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