I have two Syslites. On low, the Syslite is similar in output to my 13W CFL desk lamp (OTT-Lamp brand). On high, perhaps twice as bright. That makes sense, as we're talking 18W of LEDs. Don't forget that LEDs do generate some waste heat, which absolutely must be conducted away from the LED chips, or they will cook themselves. Thus, the metal sides of the Syslites appear to be the heat sink, along with a temperature sensor.
The color accuracy is good, which helps your visual acuity. I'd say they are close to indirect noon-day sun, say from a north facing window.
I also think they are priced appropriately for a German-made 18W LED ruggedized cordless work lamp. It is not a $2 HF plug-in trouble light... though one could arguably get similar lighting output with an 18W CFL in said $2 light fixture, you will sacrifice durability, convenient size, and cordless attributes (let alone, you won't be docking your extra drill battery in said $2 fixture). The Syslite has more in common with the high-end LED video lights sold in photography shops... and even then, Festool didn't cheap out on the LEDs, where-as all the video lights I saw are still messing around with massive arrays of cheap 5mm white LEDs... you can bet out of a hundred or so LEDs in an array, there will eventually be failures.
For comparison, the $60 under cabinet LED lamps I just installed output similar light using SMT LED chips, but are already showing poor engineering choices with one LED chip fading, probably from insufficient cooling and overdriving. On the other extreme, I just dropped $360 each (!) on two articulated counterbalanced reading lamps for the living room. Similar level of light output, halogen, made in China, yet none of cordless, ruggedized, or portable attributes... but very nice for what they are. Do you know how hard it is to find decent reading lights? So much junk out there.
What is better than a Syslite? Two of them.
Perhaps I'll post some photos of using the Syslights. I think Festool's photos are already fairly representative of what to expect, though.