Gravitrax add-ons

[Equimum]

DS is getting the basic Gravitrax starter set from his gran for Christmas, and she has asked me to get him a couple of the add-on sets for his birthday. I have looked at what's available, but don't know what will be best to buy.

For those of you in the know, would be best to get the expansion track set or a couple of the special feature bits, and if the latter, which ones are best?

TIA

I would get a few special feature ones plus the starter kit - I got this for my son last Christmas and he loved it. The more special bits the better I think! Go for whatever looks fun to you and is on sale lol. All the ones I got were fun but I read that the trampoline one is a bit hit and miss as to whether it works.