Hiya, those ones look pretty cool - just be aware that most children wont have the strenght to grip and use the hand brake until about 3 years old or so. My 2 yo has a 'strider' balnce bike and they frame looks very similar to that in the pic except we dont have brakes nor does it convert to add pedals later. I got mine off Amazon dot com for an amazing price (and esp more so now since the aussie $ is so strong) compaired to what they sell for in australia. Another reason i went for the strider bike over another brand is that my ds is quite short and this one was able to be adjusted low enough for him to use it straight away.
Anywya - just my experience but as i said, the one you have linked to looks quite similar