Tredz are not specialized dealers, so any isses and your bike will have to be sent off from the tredz shop to wherever and you will probably will be without a bike for a month.
I do have a horror story, probably not what you want to hear, but i have seen a kenevo in my local specialized dealers that was bought from tredz. The bike looked like it had been built in a rush or by some unfamiliar with ebike building. The handle bars were not even centred and several parts had been put on wrong or backwards, cabling looked untidy. There had been some issues with tredz and a warranty claim. The bike had then been taken from tredz by the customer and taken to the authorized dealer,, who were going to be charging labour to get the bike working again. Specilized dealers do this when the bike is not bought direct from them. It all sounded like a lot of hassle on an initial small saving in cost on the purchase of the bike.
There are specialized dealers out there that wil do 0% finance but you will have to pay the full retail price for the bike.