Couldn't resist...
I think the decision is yours and your alone. They are both fine, fine brushes. If one vendor is giving you the delay on the Simpson, you may try to contact others (Ems, Gentleman's Shop, Lee) to see if they have any in stock if you really don't want to wait. Otherwise, order the Shavemac if you must have the new brush ASAP. Curiosity will likely drive you mad either way and by 4 months time from now you will have ordered the other one anyway.
Dennis
I think the decision is yours and your alone. They are both fine, fine brushes. If one vendor is giving you the delay on the Simpson, you may try to contact others (Ems, Gentleman's Shop, Lee) to see if they have any in stock if you really don't want to wait. Otherwise, order the Shavemac if you must have the new brush ASAP. Curiosity will likely drive you mad either way and by 4 months time from now you will have ordered the other one anyway.
Dennis