For me as an ambitious beginner, the darts are very good in the hand and the goals reminds me much easier than with all other darts with whom I have previously thrown at friends or in pubs.
My level has improved a lot through these darts, that usually I meet at least the number, to which I have targeted. The Tripple is should still be connected to a bit of luck, but the "shot pattern" looks much more "professional" from. :-) But on my first Onnnneeehundreddddaaaannnnndddeeeiiggghhtttyyyyyy (180 - 3x dripple 20) I'm waiting still unfortunately in vain - always this last dart :-( ;-) - but that is certainly not the darts ...
Durability I can not really rate as my darts always in the dartboard (Blade 4) get stuck and therefore are not exposed to pollution - but they do anyway the impression that they would endure every single time.
From my side there is a clear buy recommendation unrestricted - 5 out of 5 stars.