As a fan of the original radio series from way back, I was delighted when I heard that the BBC was going to do 6 more radio episodes with the original cast. Unfortunately, this is like listening to a reunion concert of an old rock group -- they try, but they can't recapture the original energy, and their new material isn't as good as their old hits. To be sure, there are some wonderful bits scattered throughout these 3 hours (such as "Bistro Math"), but not enough to make up for a lot of tedium, either from lackluster gags or overlong scenes that simply wear out their welcome. Much of this is due to the material itself, given that HHGTHG after its first original six episodes became something of a shaggy dog story. Still, the "secondary phase" had a manic energy, perhaps because all concerned were in some sense working with a proverbial gun to their heads, scrambling to come up with the next episode and get it on the air, mixed with great chemistry in the cast. That sort of energy just can't be recaptured, and the chemistry is gone. Although Arthur Dent remains a solid anchor, Zaphod sounds like a tired old shell of himself, and Ford, with little to do, isn't firing on all cylinders. Marvin, who was always a one note gag, isn't funny this time -- we heard the joke enough before. None of the nice sound effects and production can compensate for what's missing in the script and performances.
Bottom line: I can't imagine ever listening to these episodes a second time, which to me is the ultimate gauge of whether you should spend this much money to buy audio entertainment (much less invest 3 hours listening to them all). The old episodes on the 4th listening are still more enjoyable than these are on the 1st listening. You can't go home again.