Fortunately it seems my Black Friday purchases from Bax have gone relatively OK.
Tracking took a few days after my shipping confirmation email was received to show anything, but the amp head did arrive today (a day later than my selected delivery date).
I have another order I'm waiting for that I also made over the weekend, tracking just got updated so hopefully I'll get it by the end of the week.
Email responses were slow, it took about 2 days for their customer services to email me back and they weren't very helpful in helping me understand what was going on - fortunately things have started to progress without their intervention. The reason they gave for the slight delays in delivery and tracking status was just black friday load on both them and the couriers (I opted for Parcel Force).