Not experience but the SSA-E is supposed to provide a tuned but still combat grade non-adjustable alternative to their adjustable DMR (designated marksman's rile) trigger. Their non-adjustable SSA is sold as a combat trigger. The difference is supposed to be the precision of the break. I own a DMR and an early SSA and using the DMR's factory adjustments they are really-really close but if you're building a precision rifle I'd spend the extra $30 or so on the "E". On the other hand the standard SSA is pretty darn good.
"Government is the great fiction, through which everybody endeavors to live at the expense of everybody else." --FREDERIC BASTIAT--
Proud Life Member: National Rifle Association and the Second Amendment Foundation.
Disappointed Life Member: California Rifle & Pistol Association