I've been on a few trips to the Bernese Oberland now, using this guide both times. As far as I'm aware, it's the only comprehensive guidebook in english, and for this reason it's fairly essential.
However, I think the Bernese Oberland seems to have suffered from the changing climate more than other regions, and the real conditions of many routes don't seem to be reflected in the descriptions. On one trip, of the 5 or 6 candidates we had come up with at the southern end (all of which seemed perfect in the guide), the guardian at the Oberaletsch hut reckoned only two were still safe to attempt - the rest were dangerously unclimbable - and some of our party had a very real encounter with one of the 'unclimbable' routes the previous day. I don't expect, or want to know everything about a route beforehand, but I put this in the category of things that should be mentioned (we had a few other minor experiences the next season, that would have been helped by a realistic description of the conditions in later season).
I accept that with all the effort that goes into a comprehensive guidebook, keeping it to up to date is extremely difficult. The bottom line is get another, preferably more recent, guidebook too (something like The 4000m Peaks of the Alps - Selected Climbs
for the big peaks), and try and ask someone with local knowledge (hut guardian/local guide etc).
- a nice little sport cragging section (useful for rest days)
- quite out of date