I bought a couple and swapped the doors. Then made a set of brass contacts for one and compared it against the other - not really that much difference, but the fit is better. I also have the 'Tea' coloured clear version. The door on mine was warped and required heating and gently bending into shape - otherwise fine. The FT Boxer squonk is also one to consider - I prefer it to the Frankie and IMO it hits harder and the
batteries are a breeze to put in and take out. Probably my favourite mech squonk. Hope this helps.