I owned the Eryx and the T4'14. I sold the Eryx because I found the T4'14 generally easier to drive (larger set up window) and more durable.
Not knocking on the Eryx, the fastest guy on the track drives one but the T4 just give me that much more confidence which allows me to push the car even more.
The T4'14 is well worth the extra $$ in my opinion. Or you can wait a bit longer and see how the AE TC6.2 holds up.
http://www.amainhobbies.com/product_...ouring-Car-Kit