its cheap and chineese..... some work, some are shit.. its chineese, its cheap.. do the maths. id buy a german one.. even the "real"keihins are shit by comparesen to the stage 6/bgm black edition of this carb
the dell carbs are tried and tested, better for road use, flat slides work better, but drink more (obviously) and there are quality issues with the cheaper ones. even keihin use "copies" now.. ive seen some with missing idle curcits (hole isnt even there) so yes there usable, but you have to know what your looking at
Got myself a 25mm dellorto and pm manifold on the way ,just need a gasket set and cylinder nuts then im ready to build my engine