I think the K-28 is the best NG engine they have offered to date. I have owned various NG models and like the K-28 the best, good detail and wonderful running engine. I expect the K-36 will be similar but we will not know for sure until we see the pre production model, which I think they will do since we know the current prototype have been around for years. K-28s will be sold out before it gets here, so if you want a good running engine, get the K-28 so you have it while deciding if you want a K-36. My 2 cents.