I just won these shifters - what do you reckon , not bad for £75 inc p+p? or not great? and where does '105' come in the sequence? the way i understand it it's Dura-Ace <--- highest Ultegra Tiagra Sora ??? others ??? ??? <----- lowest where does 105 fit into this? are these shifters going to be alright do you reckon with my existing 8 speed mech, and new cable outer?