It sounds like this has been a positive experience in general. You may want to consider how leaving would affect your personal and professional relationships. Sticking it out, and perhaps being a valuable member of a transition team, is good experience. Additionally, that narrative is great when interviewing for your next position.

4-6 months is not a long time.

For contrast, someone else asked something similar, but with a much different context. I commented here as well: Ask HN: "Should I leave my startup?" https://news.ycombinator.com/item?id=12382772