I've got the Isocore, the X27, and the X25 I like all 3 of them. Some one was complaining about some vibration in the handle of the X27 splitter i think it was. I had a little bit of that in the X25, so last night i took a 5/8'' black rubber hose and oiled it up a little and stuck it as far into the handle of the X25 as i could. I think it actually helped! So far i haven't felt any vibration to the end of the handle. I've got more splitting to do, so, i'll let you know how it works, i'll do the same to the X27 as well.