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@Frankie_J
The motrax one is ridiculously heavy, and I don't tend to carry it anywhere because of the weight. I'm still not completely confident in using it as a sole lock, only because I don't know any reviews either.
A few things i've noticed are: the main shackle is square and 19mm, whereas the bottom part which connects to the body is round and maybe 16mm? This bottom part does extrude enough to cut across so effectively you could just cut the round part, making the rest of the 19mm pointless.
The plastic casing on the body feels very cheap, so I dont know if breaking through that would create an issue, (temped to break it just to see the inside).
Also you have to push the shackle completely in to unlock it again.
So at the moment I'm using it alongside my old Ny3000 to lock me and my girlfriend's bike together.