I bought this game on DVD in 2007, bought on Steam original + add-on and will buy it here on GOG. Never regretted. Game still buggy, community patch badly needed, but the game top notch tactical part and you can dive deep into weapon customization, HardLife pushed that even further. I play on Linux under Wine and save every 40 minutes, so crashes doesn't cripple my progress. So far, so nice.