I like my Cobra Sidewinder, but it has the coiled fiber.
The only drawback I see to the coil is the P.I.T.A. factor (Pain-In-The-...) when it comes to changing pins.

They are bright, but not TOO bright. Without a light, I had it at the range last year at dusk, and not only coudl I see the pin for a s long as I could see the target well enough to shoot, but it never drowned out the target.

There may be better, but mySidewinderis serving me well.