I've yet to here of anyone being initially happy or later with a Hyde brace.
RGM's is discontinued so we are left to someone making up a new style.
RGM brace leaves the top bushes in the top of sliders as normal but does extend the slider support somewhat via raising the sealing bushes ~1.5" above the support bushes. I went nutzo trying to get free action via the RGM eccentric collars, even relieving the adjusting collars, which helped enough to ride ok but I finally checked the stanchion tubes by rolling against each other to find them the cause, so bought new stanchions for Peel, which solved her striction issues and had a shop straighten her old tubes which I now run in plain Jane Trixie just fine, w/o anything extra to alig for free travel. Deer impact bent Trixies forks, ugh. I think Peels first wk drag strip wheelie crash tweaked her tubes landing on me. The extended slider support is a total non issue on fully extended forks on the fly as at full extension a fly weight instantly compress em again so you really can't impact forks sideways on full extension in any condition a normal user could encounter in traffic or most race tracts, only a nut case like me flying like Speed McQueen ~60 mph in raw pasture to hit a bump to lift front off ground then next instant snag front wheel in gopher hole and blast a trench through ~6 inches deep of root bound sod explosion that launched whole bike sky ward with such impact my helmet chin hit the bars hard but landed fine w/o no bend or damaged items detectable, ahhh. Off road don't usually need a fork brace as there is never enough traction to twist up forks unless you hit something like a hidden stump in brush on enough power the forks are extended floating over most the roughness. Only wild ass WOT tight chicanes near red line in 2nd on rough rumpled chopped up frost heaved surface does a fork brace become a useful item to me.
With a rump rod and its 2 helpers I can take my Peel Cod beyond what other bikes can take w/o crashing, nay invites me into it, so She needs a fork brace to take the fork twist up saving a low side trip down by sudden straight steering snatch up to induce a hi side that jerk/flys up off rear tire's forced hook up to lift > throw front in the air to land ~90' to travel at like 55-60 mph at full fork lock and rebound into new line off WOT torque on smashed down rear patch traction. I don't think I'm riding turns fast until front is about useless and lifted out of traction ok, so my Peel needs don't apply to anyone else. I no longer try to ride like this on anything else, be it modern or ancient, as they just can't take it, the poor corner crippled dangerous things.