Thanks for reviewing the tips, they are an extremely important part of any user's kit. The only thing that bothers me about the W1 is that they can only be bought in SML packs everywhere, so for the price of three (about 25€) you are actually buying the only usable pair. So I'd rather try the Omni, which can also be bought individually according to the size that suits (14€). My collection of Spinfits is so far limited to the CP100s, which however colour the sound of the IEMs quite significantly...
Headphone Reviews and Discussion - Head-Fi.org
corgifall
CP100+ had less overall added color but I prefer both the W1 and Omni to all their prior tips so far. I do wish they would start selling W1 in specific sizes like the Omni.
scracy
Spinfit W1 are out of stock at Amazon for a reason. Individual size W1 packs are on their way that's the good news. However even as one size they still will only come as one pair and are still expensive.
Thanks for the info @corgifall!