EDIT: Oops, didn't realize this thread is age-old.
Great deal going on right now over this fantastic RPG; the core book pdfs are up for a steal and also the adventures if you splurge a bit
https://bundleofholding.com/presents/DarkEye
What's the base system like? I.e. If I like things like Chaosium's BRP system, Warhammer Fantasy role-play 1st and 2nd ed., et al. am I likely to want to play/run this?
It's way more simulationist. Every skill is based on three attributes, e.g. climbing is based on Courage, Agility and Strength. To pass a climbing check, you need to roll three D20 in succession, each roll needs to be less or equal than the character's equivalent attribute. You can use skill points to compensate overshoots, your remaining skill points denote the degree of success.
Combat works similarly, you have an attack and a defense base stat that is derived from your attributes. For each weapon type you distribute your skill points on the attack and defense stat at leisure. Successful attack is rolling lower or equal than the base attack stat + assigned attack skill points + weapon modifier and is parried when rolling lower than or equal to the defense stat + assigned skill points + weapon modifier. There are a plethora of additional maneuvers, like making your own attack roll more difficult in order to do more damage or impede your opponent's attack on success. Also there are three distance classes for melee combat that opponents can attempt to switch in between, so the outcome of a halberd vs. knive fight depends on who's better in maneuvering between distance classes.
However, DSA's not nearly as deadly as WHFRP. Joe Average sports about 30 hitpoints, while a sword deals 1d6+4 damage. One hitta quittas are very, very very rare. Also, crippling, insanity and other character gimpers are uncommon.
Ruleset and game world are very interwoven, converting it to your average D&D setting presumably requires a lot of work.
Does the player set come with Gjaskerlanders?
With Gjalskerlanders, Fjarningers and Trollzackers, all barbarian-heavy cultures in the game world get their share, however only with one page description each. If you're interested in the lore, the regional fluff books of previous editions are richer in detail - but I don't know wheter translated versions exist.