EO5.....looks like same size and twice the output at 27 lumens.LOOOOVE mine for sure,thats a top quality build for sure,just plain excellent.

Fenix makes fine products but in researching Im seeing the S2 and S3 bulbs have serious quality issues so smart money says beware on lights with them,surprised how many reports of failure,etc with those.

Just bought ten various lights at Deal extreme last night,4 cheapies to replace the Harbor Freight trash I have around house (They 'sorta' work,horrible quality) and some sipiks for vehicles,low cost ten dollar lights that have good press for value,build and output (80 to 200 lumen ranges) over at candlepower forums for a sub 10 dollar light.IE,switches can be bulky at times but will turn on/off,just may have to do it more than once on occasion.Bargain lights.

For carry lights I'll stick to Fenix.Just astounding quality.Thank you all for teaching me about them.

I'll let ya all know if the Sipiks are worth it in real life.