Shipping was fast and communication was great, thanks.
Great that it ships with a pair each of different sized ear foams (the titanium bit and the ear foam things are separate) because my left ear canal is much bigger than my right.
If you need to push it further in, better to take it out again and reshape the foam (which is a bit hard to do - it bounces back quite fast) instead of pushing it in more forcibly - I realised I broke my ear foam doing this when I woke up.
If you choose a foam too big for your ear canal, it will hurt a bit like normal foam plugs. I took the advice of another reviewer and put a bit of oil around the tip and that made it easier to slide in. Not sure how good it is for the lifespan of the foam but it's a solution for now. If you choose a foam size too small and you're a side sleeper, sound will come through around the earplugs on the side you face down on.
As mentioned in the product description, it leaves some sound to come through, so this is not necessarily suited for sleeping if you need complete dead silence (I ended up using the green putty stuff I ordered along with this to try for sleeping instead, because of this and because it didn't hurt my ear canals, which this still did a bit)
Might end up using this for day stuff and concerts rather than sleeping.