I bought a used mx-3x many months ago. It replaced the rtr radio from my sc10 rs. It works fine but after I bought it I found out it had been repaired/abused(owner threw it across a track). The spring inside is not equal both directions. At the left full lock it seems to flex weird and tries to stick in full lock. no big deal for the most part. 2 months ago the radio fell off the pit table and broke the wheel off flush, I glued it and it works but just scared it will fail at any moment. Now the question. Should I get another mx-3x or should I just go with a mx-sport? What is the difference between the two? I have 3 receivers for the mx-3x, will they work with the mx sport? I only run stock SC and mod ST when there is a class for the ST and a vrc adapter. Thanks for any input.