I bought a 2.0 ltr one off ebay many years ago (still about £75 for the 3.0l unit).
It gets used for many hours each month and it still works as it should.
I still have the JML one that it replaced, the JML one cost £100 about twelve years ago, but some of the resin broke off the vibration unit and it was always limited in use as it only has one central vibration unit, where the ebay unit has two.