I currently have 2 FeV 4.5S+ and love them dearly. The SXK is about the easiest way of getting hold of a Clone as the Company do not export to the UK due to TPD restrictions. There are ways of bypassing this, but as you are speaking about the SXK I won't go into that.
The SXK version that a friend has is not too shabby. It produces a nice enough vape but the overall quality isn't quite the same, but then at the price of the SXK compared to an authentic, one has to accept that there will be differences.
One thing to be aware of would be the Air Flow Screws. The SXK doesn't "appear" to come with as many variations as the authentic, so you potentially could have fun trying to source other sizes.
It's a very easy RTA to build
The Flavour production is exceptionally good, The Draw is perhaps somewhat limited due to what options SXK provide, so I can't comment with any degree of certainty.
I will say though, that for me and my style of vaping, the Fev is in joint 1st place, tying with the Squape N'Duro. They both produce a similar experience and it would be another I'd recommend researching. Be aware the Squape is a 24mm diameter, so possible too big, depending on your Mod.
FeV in standard form.
FeV with Steam Tuners Tank.