We got this as an early birthday present for our son who's turning 4 in May. The main reason we picked this bike of course is because our son is a Thomas fan. The other reasons were the price and that it's eligible for site to store shipping. We love free shipping and this came in no time. When we picked it up, our son squealed in delight when he saw the box. It was very easy to assemble. I am 35 weeks pregnant and I did it myself. I volunteered to do it since I love assembling things and it was my first time to assemble a bike. I had my husband tighten the quick release lever for the seat since that was the only attachment that required strong force without the use of tools. The manual was a bit confusing at first since it's for a wide range of models but after I located the sections applicable to this model, it was OK. I only had to use one tool- a wrench. It's a sturdy bike that's worth your money and it looks great too. Our son was riding it that very afternoon.