Here's my current opinion on the Niagara - it's frikkin awesome! and my favourite mod, though I highly recommend you put a squonk RDTA on it to make it the perfect squonk setup, like I said in the review the kit RDA isn't even worth trying.
The Vandy Vape Pyro V2 RDTA also works well on it.
I have bought another one since in Gunmetal, trying hard not to buy a 'spare' in case they stop selling them.
Now for the good news......
The Kits sell for around £65 in the UK, I got my 2nd one Mod only for £29.30 from Aliexpress and messaged them regarding postage, it arrived in less than a week from China
Link is too long but search for:
Niagara and you will see your options
https://www.aliexpress.com
You get a discount code the first time you sign up and order.
I bought from Store:Healthy Vape Store and they made sure I didn't get the grey card of doom.