The PMD620 has a dedicated hold switch that disables all of the buttons. Actually, you can set it via menu to either “All” or “Partial”, which leaves the record, record pause, and stop/cancel buttons functional. Battery life is pretty decent, about seven hours with regular alkalines and a few more with lithiums. Handles power interruptions well; it properly closes files when the batteries run down, AC power is pulled (with no batteries), or even when a battery is pulled out while recording. Provides sufficient plug-in power for most small mics if you want to travel as light as possible. Can record files up to 4GB. Noise levels are low enough for most applications, except maybe quiet ambient or soft acoustic, and definitely won’t be a problem for metal shows. Pretty nice design and layout too, in my opinion. USB transfer is pretty slow, though…
The Oade mod’ed version is quieter than the stock (I have both) and sounds really great. He disables the internal mics, however, which could be an issue for some.
All of that being said, though, I have to admit I am seriously considering a PCM-M10. Unbelievable battery life, nice build quality, and easier service than the Oade PMD620 (I live overseas). The one thing I want to know (and have not seen addressed here) is how hot of a signal the line-in can take. If it can take a hot board feed, for example, I am in…