I went to Birmingham BMX track once before I was laid up with injury (not related) and it was fantastic. I took my BFe because I was scared to take my BMX as I have ridden it about 10 times in the 10 years I have had it.
Don’t worry about not being able to do the jumps, I started not being able to do any of them and after two hours could do the first step up and was trying a couple of the others. As soon as I can ride again I plan to take my BMX down there and get some practice in. From the small amount I have done I was surprised how much fitness you need on a little few hundred meter track.
I cant see myself going to the skate park or DJs on it but it will certainly help with jumping my MTBs.
Go to your local track on your MTB and see how much fun it is, you will want a BMX after.