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It'll never perform nearly as well as a badger brush. The two big downers are:
1) The bristles bend easily, so you have to whip up the lather with a delicate touch.
2) The plastic may irritate...

I use a Wilkinson brush as a traveller.
1) The synthetic bristles dry quickly and can be mistreated in suitcases
2) The lather is adequate
3) It's cheap so I don't care if I lose it