The strongest I've ever tried is the Hitachi. I don't need something that strong (most of my vibes are in the 3-4 "vroom" range), but I can certainly handle it, and probably go higher.

I only purchase toys that are 4 or 5 on the vroom scale. I like stronger vibrations.

I have tested other toys for small companies (not through EF)that have actually reduced motor speeds because of complaints of "too strong"! I can never understand that though (and after my review, one of those small vibes went back to research to have the strength of the motor increased). There is never such a thing as too high for vibe settings, there is always someone that wants it stronger than I like them and I like them VERY strong!

The major issue I've seen with the smaller companies is the small sample size they get for original testing before products are available to the mass markets (like here where there are lots of gals like me who like the super strong vibes).

I dont like it if they get too loud though

That's a very personal decision. Some people like a little tease and some people would prefer to strap on a diesel engine. Personally, I wanna feel it on my naughty bits, not in my stomach.

i like fast ones and intence ones.

I kind of like mine to be more gentle, but I use rabbits.

too High makes me giggle