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Temperatures
All temperature charts are sorted with lowest load temperatures at the top.
As you can see, the Leto's relative performance is best when tested with the CPU at stock clocks. Here it performed almost identically to the bigger Cooler Master MasterAir Pro 4, despite that cooler having an extra heatpipe as well. For the money, the Leto's stock-clocked performance is quite impressive.
However, things take a slight dive once the CPU is overclocked. Incidentally, the delta T of 68.6 degrees was recorded with an ambient of 24.4 degrees Celsius, so the real-word CPU temperature was well into the 90s and very close to TJMax.
Acoustics
At least part of the Leto's lacking performance (with the CPU overclocked) can be explained by acoustics – its fan is very quiet even with the CPU stressed to the limit, something I was very surprised by. In-fact, I would go as far to say this is one of the quietest air coolers I've tested, coming in just behind the Scythe Mugen 5 PCGH Edition. With the CPU idling, or even dealing with some basic tasks, I could not hear the fan spin at all.
Having just bought and installed this cooler on an i5 4570, the black plastic spacers are threaded, so if you put a backplate bolt through, and then put its black spacer on, it stays in place perfectly. I didn’t drop a single screw whilst building.
I was also really impressed with the thermals considering the price and whisper quietness under load. Definitely an amazing cooler that I definitely recommend.