First of all, I would like to say I am a fan of the King's Bounty series and Darkside is not a bad game. Actually, it has the potential to be one of its best installments. The key word being "potential".
Unfortunately, I cannot possibly recommend buying it to anyone. After one month participating in the early access program, I logged 400+ hours playing and testing it. I posted several suggestions in the forum and took part in several other discussions posted by others. The developers gave us, non-russian speaking customers, almost ZERO feedback. All we got were sporadic monosyllabic posts about technical issues. They posted no information about patches and/or the work that was being done.
They pushed back the release date 5 days without warning us - let alone telling us why they did it. After these 5 days there was a cosmetic 10 meg patch and that was it. The product was out.
As it happens, the game they put in the market bears very little difference from the beta version I started playing one month ago. There are huge empty areas, very little or imprecise information about several quests, many balance issues, unclear tooltips, and possibly a number of minor/major bugs. In short, it is NOT a finished product. I expect (and hope) there will be future patches to change all this. But, unless you want to buy an unfinished product, I would wait a few months to buy it on sale.