I've had this watch for 2yrs+ now and have just changed the (user serviceable) battery for the first time, as the compass had stopped working. This is to be expected as it uses more power than the other functions (but it does have auto-off in the compass mode after a time to save energy). There is no bubble level on this model as it has a mineral crystal glass instead of the usual plastic. I have knocked this watch so many times against things and there are many surface 'threads' you can see given the right light, but no truly visible damage, like big gouges or cracks like the plastic would show. The logbook feature is a great asset. Based on a rolling record (oldest record deleted when the memory becomes full), the logbook records Altitude and can be set to different sample rates (e.g. depending on whether you are walking, climbing, driving, etc.) and includes a record of greatest height. The logbook cannot be deleted (but as stated records over itself) but the max height can be reset independantly. The backlight is a little dim, but fine to keep your night vision, and the temperature does not compensate for being on or off your wrist (like some Casio models can). For a large watch (you won't lose it!) it is quite lightweight, with an aluminium case and carbon shell it also looks great. The new Ti models do not have the same clarity of display though so I would say stick to this screen size, but maybe get the heart rate monitor (HRM) model if you also exercise (cycle, etc) - it's only a small premium and it *is* a Polar model! I imagine the batteries might last less time due to the HRM receiver, but this at least is user-serviceable (and retains the watches environmental integrity, unlike changing a Casio battery). The only sad thing is the screenprinted/anodised(?) graphics for the points of the compass rose are wearing off - Suunto take note, laser etch/engrave them next time!! Sighting grooves in the bezel would be useful too, for taking bearings, but at least the bezel stays smooth as silk on this model as it has ball bearing detents rather than the friction-based ring the plastic housings have which stiffen up so you can't use them.
A few minor details aside (like a strap not long enough to go over your coat - just get an velcro Animal strap - and the print wearing off, and maybe the price), this is a cracking product, rated up there with the Garmin eTrex Legend GPS :-)
If you want a barometer, altimeter, compass, thermo & HRM in a decent, reliable, user-friendly package, this is it!