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I've got one on my Crabon bike as it has no holes to mount my light anywhere else, it does what you need it to. The one advantage is with the light on your bars you can re-angle it really easily which is helpful at night, it just means the light is mounted a bit higher than you would like.
I use the Secular rear mounted on the seat stays, mine are really skinny so I just used some old inner tube and electrical tape to boost it out so it doesn't shift about when you cable tie it on.
Anyone here has experience with this: https://www.bike24.com/1.php?content=8;product=144886;menu=1400,1410,1415;mid%5B39%5D=1;orderby=3
I need to get a stay mounted rear light (because carradice and small frame) and secula is the best I've seen which means I have to get a B&M front light too; most likely IQ-X.
Plus overall it will be cheaper than Supernova E3, unless someone can point me towards a stay mounted solution for E3.