Per my Driven rotors review, I'll address three things about this purchase: looks, performance, value.
LOOKS - we'll start with this: I bought a set of these DEI LED bolts because I'm an LED 'ho. You should see my 'Busa - counting each LED bulb individually I have probably 200+ of 'em covering my bike. So, the set of DEI button head LED bolts I bought were literally just an accent in a sea of LEDs.
Howev'ah! They are a nice accent as I placed them up by my mirrors/trailing edge of my windscreen (and I do have a pic to include). The other LEDs cover the rest of the bike but having these way up high helped with "light" balance.
Specifically about the DEIs - the bolts themselves look clean and bright. Not shoddy or unpolished looking even up close.
PERFORMANCE - the LEDs set into the Allen head bolts are bright. I bought red. Wiring them is easy as well. I use insulated male/female connectors on all my LED lighting so just crimp two on and you're done.
CAVEAT EMPTORE (and this is why I didn't rate these 5 Stars) - the spot-welded wires on the backside of the bolts can get pulled off easily.
I had to remove my fairing for a CCFL Halo 2 headlight installation and the connector snagged something and "pop", off came the wiring where it was welded.
VALUE - so, I have a second set on order. I could (and will try) to re-spot-weld the one I have but I fear the connection won't take/hold so I'm taking no chances. If the wiring at the spot-weld hadn't popped off so easily I'd say these bolts were a great value but... now I have to order a second pair.
Also, consider this when ordering these if you're planning on using them all over - it's all fun and beautiful light show once the work is done but underneath you'll have a spaghetti forest of wires that can interfere with bodywork R&R and are at risk of damage when working on the bike (or at least inducing a "blessing" fit from the mouth). Obviously, I'm assuming these DEI bolts would be in addition to a more serious LED effort.
And make sure you label your add-on/LED wiring so you can keep track of what's what.