I don't have any of those but I do grow most of my veg in plug trays of varying depth.
At around £12 a time I don't think I will bother.
I find that an old dinner fork, or sweet fork (as I use) does the extraction job just as well as yours will.
In fact years ago I seem to recall a polystyrene version of one of these!
What I find with cells is they don't ALWAYS remain truly vertical, and as you apply the pressure to push them out any that are out of 'true vertical' offer a resistance, and you sometimes end up having to use other means, e.g. a fork, to extract the plugs.
I would guess it should be OK for the first few uses but once it gets a bit brittle it loses more of its effectiveness!
For your sake I hope I am wrong and the aforementioned is only an opinion!