Baby/Toddler Trikes

We've decided to buy DS a Baby/Toddler Trike for his 1st Birthday, and just wondering if anyone has one and what are the pro's and con's?

We need one that has a fair bit of support to start with and a 5 point harness. We also need it to have some side support that is removable so that we can get DS in and out as he has hip dysplasia and is in a brace (it seems alot of them have a ring like support which you can put the baby into, but as DS is wide due to his brace we need it to open so we can put him in from the side rather than the top IYKWIM)

So far the most suitable one we have found so far is the Little Tikes Deluxe Wonder Trike, but it only has a 3 point harness, we really need a 5 point harness otherwise we need for DS to grow a fair bit and be out of his brace so he can support himself in the 3 point harness otherwise we wouldn't be able to use it for at least another 3-4 months. (I want him to be able to enjoy his birthday present immediately :) )

Perhaps I might just get it and purchase a 5 point harness seperately to attach, but if anyone has one and can give some advice or feedback I'd be most appreciative :D

Thanks
Naomi