Agree with revs points completely
Also would add, you are better to build than rtf, it would be cheaper and when you crash you will need the skills and kit anyway
Now the vortex - the vortex is a good rtf quad, however that one isn't. Understand the financial possition but that is running 1806 and I think 2300kv motors, and from some of the parts lists I am inferring it is rocking a naze 32 earlier than v6.
(To be clear you are looking at a mid ranged quad from over two years ago, and this hobby moves fast)
As a starting quad it would get you off the ground and probably be ok to start with but way before you pay off the finance, and/or as soon as you fly with anyone else you will find it is slow and cumbersome
At that point you have three choices: get something else or upgrade, become bored and move on, either of the first two is gonna cost cash
If you can organise finance outside of the supplier there are better and less expensive options elsewhere