I own many of the "Hammer" products. It's a fun and easy game system to learn. And this Core version is the cleanest version to date. Even if you own some of the other Hammer products, I'd still recommned it.
If you're new to Squad Hammer: At first glance, it might seem simplistic, but there is a fair amount of subtilty. You need to soften up an enemy unit in cover, but long range shooting probably won't shift it out of a defended position -- you'll need to get up close and personal for that. in other words, the rules encourage realistic tactics without a massive amount of rules. A combination which many/most rules are not able to achieve.
I also want to make special mention of the layout and design. Nordic Weasel has in the past had fairly simple layouts for their products (which I actually appreciated since I like to print out my pdf's). However, this product sees a much slicker presentation with photos illustrating the rules and a very nice quick-reference sheet. But it won't kill you printer cartridge either.
Well worth the suggested pay-what-you-want price. Looking forward to seeing what Nordic Weasel does with the Squad Hammer system!