i use em on everything and never have had a problem with them, don't know the problem Dr1Driver might be having with his/her setup but I'd recommend one between the carb and the tank. also always fill your tank between the filter and the tank, not through the filter. on turbine engines i always mount the filter vertically to prevent air getting trapped in it but with a glow engine their size is so small that's never been a problem, glow engines also don't flame out as easily from a trapped bubble in the filter when it comes through, it just leans the mixture for a split second and then right back to what you had.

kc

EDIT: FYI, those who don't use an in line filter you should stay away from a pumped engine such as YS's, Gasser's, Turbine's, etc......