I havnt herd of anything as of yet. The 424 is simple and reliable, but it leaves bit to be desired. Dont get me wrong, i love the thing, and yes is worth the 252$ i spent on it, but be sure and keep that thing clean, and correctly lubricated. BTW, i know where there is a 424 select for trx300fw. Ya'll feel free to private message me. I can get you in touch with the shop that has it, bran new in the box. Tim.