In January had an eTrex H in my right hand and an eTrex Vista HCx in my left hand, and went on a walk during a hard rain, testing usability of both devices simultaneously. I settled on the eTrex H.
Sure, I wish it was easier to enter text on the H, and I wish the battery life was a little longer, but there are distinct advantages to the H: you don't have to worry about pushing on the joystick (this can happen easily and will result in a waypoint being added), it is bright yellow, it fits better in one's hand, the enter button is more ergonomic for one-handed use (I find using the joystick one-handed to be awkward and 'slippery'), it is cheaper, and the screen is easier to read in full daylight. I got mine from Target.com for US $80 and a USB cable for US $12. Oh, and one thing not advertised properly: the eTrex H is 0.6oz lighter than the Legend and Vista models. This is because of the 0.5oz weight penalty of the metal clip attachment embedded in the battery compartment panel on the Legend and Vista models.
Since I input my waypoints from the computer, it's not that big a deal that input is slightly slower on the eTrex H. And in the field, if I want to mark a point, I simply press and hold enter, letting it name itself (usually 001, 002, 003, etc). I then mark that number on my map. When I get home, I rename the waypoints on my computer. This is a faster method than changing the waypoint name, even on a Legend or Vista. This also works great for out-and-back hikes with no pre-imported waypoints; I can simply create waypoints 001, 002, 003 etc. as I hike; if I get lost, I just have to create a route home following the descending numbers.
One note about the battery life: the battery indicator will go down to low while there is still 50% or so charge left. This fooled me at first, but I still got 10 hours or so of constant use after the battery reached low using Alkalines. So do don't rely on the battery meter. Using 2 AA Lithium Energizer batteries, I can get almost two full days of hiking with tracking on before the battery dies.
When on trail, I keep the GPS off, and turn it on to mark a waypoint at trail intersections and landmarks. Then, if I get to an off-trail section (i.e. alpine exploration), I'll keep it on, creating a track. With this kind of use, a set of batteries installed plus a spare set is plenty. Since I would also bring an extra set of batteries for a Vista HCx, I save 0.6oz using the eTrex H without the reduced battery life being any kind of detriment (other than the expense of having to buy Lithium batteries more often, which is offset by the cheaper initial price of the GPS).