CJP..I am probably the biggest tester of mic processors..I have had or have one of darn near everything..Here's the scoop as I see it.Valley 400 or 401 is great box but it doesn't power a phantom condenser mic (It DOES have a set of "bananna jacks" on the back that provide 48v, but if someone can tell me why they did that I'd appreciate it) Increasingly harder to find a good clean one..(Try Ebay Canada)The Valley Dyna-Mite combination is sweet..I use a dual channel version, so I EXPAND with one of them, and feed the COMPRESSOR with the output of the first channel..It can be adjusted so it is very subtle, yet it keeps the levels up there..however it can only be used as an outboard box..has no preamps..so then you need a GOOD mic-pre like the M610 or (a new secret weapon..) a TRUE Systems Solo P...to feed it with. (This is really a great mic preamp!) Also these DynaMites are a little hard to find. But if you find one..grab it. They are cheap as the audio purists think they are bogus, and gritty sounding..only if that they way you want them to sound.The Symmetrix 528 box annoys me no end..It's expander/gate is AFTER the compressor..so when you stop talking..the compressor brings up the noise..the expander thinks it's a valid signal, and waits a nanosecond to clamp down on the noise so there is always a "whooosh" noise at the end of every spoken word..mehThe Air Corp Pro Announcer is very good, and probably the best value..but....it's preamp is a little harsh..I like to feed it with the M610 or another clean mic pre..it's got the proper config of EQ/GATE/COMP in that order..nice, but sometimes pricy. It will compress like crazy, but keep it clean and punchy sounding. If you get one..call me to discuss switching two of the jumpers inside..there is a phase corrector which can sometimes make the mic sound muddy, and an EQ setting via another internal jumper..all fixableThe AVALON units do not have an expander..nor do the really expensive Manley boxes..Focusrite makes a really good voice Processor Steve Mitchell in Atlanta swears by these, and he is considered to be one of the cleanest sounding voice talents around.I have heard that Don LaFontaine uses the MKH416, and some major studios he frequents use a Neve mic-pre, and an interesting combination of a graphic EQ and an old LA2 in a VERY quiet room..John Wells uses the MKH416 barefoot into a stock Mackie console..but with his voice who needs ANY processing?George Lowe (Space Ghost Coast to Coast) uses the MKH416 into an MBOX and ProTools LE with no processing..I must admit that I am using less and less processing to record straight voice these days..and the end-user production guys are doing thier magic..The retail clients insist on no, or little processing. But for my own multitrack stuff, I love the sound of a good screaming compressor! 16:1 and all the buttons mashed in on the 1176LN...!! 0.2 ms release and attack! LOVE IT