I just had a look at that comparison page and they do seem pretty similar. The only real benefits I see is the Etrex 30 has longer battery life, is smaller/lighter and costs $319 compared to $445 for the 62s (from johnny appleseed GPS).
I've been really happy with mine, heres some pros and cons from my experience so far
Good- GPS are great in the field but I love looking at the tracks later on at home on my PC, I don't know exactly why but I do.
- gets a fix really fast and will sit on 3m accuracy all day. Accuracy is good under dense cover, in valleys and worked fine in a narrow gorge a few months ago.
- acquires a large number of satellites. Don't know why this necessarily that good but gives me confidence that I am getting a good fix.
- the screen is small but easily readable and no probs in bright sunlight
- has a barometric altimeter which seems spot on when comparing to the topo. Its interesting looking at the plot later and seeing the horizontal
and vertical track
- does everything and more than I need (area calc, sunrise/sunset, etc etc)
- the interface is easy to learn and use & it has room for a fair amount of customisation. I only have a few pages turned on so that I don't have to scroll through a dozen different pages every time I want to go to a cetain one. You can easily add data fields to the different pages eg altitude, course, speed etc on the map page which saves a lot of scrolling.
- very straight forward to save tracks/waypoints etc but its a bit laborious typing in the name as you have to move the little joystick and then press it for each letter and it can be a bit finicky. But it doesn't bother me, thats just being picky.
cons- batteries drain if left in the unit ( I don't know if thats just the way it is with all devices or if there is a setting enabled that draws power while the unit is off eg updating its position data so it can get a fix more quickly when its turned back on?). Lesson learned but it was annoying to get to the start of walk that I was keen to plot and then having the unit die after less than a minute. I had charged the batteries 2 weeks prior and left them in the GPS and the spares were back at the camp too far away.
- the 3-axis compass needs to be calibrated every now and then or it seems to jump around and give spurious readings. Very easy and quick to calibrate though & I just remember to do it whenever I remember to do it or it starts behaving strangely.
- hmmm, the only other bad thing is how slow it is to load custom maps. I made a few custom maps and loaded them on and thought that it wasn't working but its just really really slow to load them. When they do load and you use the joystick to move the cursor its reall really slow to catch up... I have given up on custom maps as I nearly always have the topo with me and I have since loaded shonky and the contours aust. maps which I'm more than happy with.

- a snippet of the most interesting part of a recent walk
ALWAYS be yourself.
Unless you can be outside, then ALWAYS be outside.