Some broadheads like Muzzy have a better blade retention style than Thunderhead, but when I hunted with them I never lost a blade, so that was a non-issue for me. I could get those blades so sharp they were scary to even think about touching![]
I found them to be a nice high quality head, and didn' t find a need to switch until I started using the extra KE my newer set-ups were generating to power large cutting diameter mechanicals.
If its working for you and you have 100% confidence in them now I see no need to switch to another style/brand unless you have specific goals in mind.