We bought Woom 3 16" bikes for our twin 5 year old grand daughters for Christmas. They are freehub, hand brake models and are 12 pound bikes. They started without pedals and used them as balance bikes for about 4 weeks. They put the pedals on and have been riding up to 4 to 5 miles per outing for the last 4 months. My only complaint is they are geared for ease of start and pedaling, which means they are spinning out on the down hill slope.
While these bikes are pretty expensive they are great bikes with an active after market. They re-sell very quickly at about 80% of purchase price. Woom will also buy the bike back from the original owner at about 60% of purchase price, but you have to pay a fee to opt in to the program. All in, ownership after sale of bike to upsize, is comparable to less expensive, heavier bikes, albeit with a higher initial investment.