I put the CycleSound on my road bike for my morning ride. It's pretty easy to install, but if you are going to use it on more than one bike, it's probably worth it to get a second mount. The unit has a rear zippered access flap that encloses the battery compartment (6 AA). There is just enough room here for a spare tube (23c) and one CO2 cartridge. The bottom has a zippered pocket where your music player goes. In addition to my 2nd generation iPod Nano, I was able to fit a couple of tire levers and another CO2 cartridge. There wasn't enough room for my inflation pump, although there would be for one of the smaller inflation chucks. Under this zippered pocket is an open mesh pocket which might be convenient for small items, but it didn't seem very secure to me.The sound quality is quite good and the volume is loud enough to hear, but is limited so that you can hear what's around you. I have no idea as to the unit's durability, but it seems pretty well designed and put together to me.
Here's my playlist from this morning.
Take Five - Dave Brubeck
Classical Gas - Mason Williams
Krafty - New Order
Beer - Reel Big Fish
Zoot Suit Riot - Cherry Poppin' Daddies
The House Is A Rockin' - The Brian Setzer Orchestra
The Impression That I Get - The Mighty Mighty Bosstones
My Back Pages - The Ramones
Here It Goes Again - OK Go
Lump - The Presidents Of The United States Of America
Who's That Girl (She's Got It) - A Flock Of Seagulls
The Ballroom Blitz - Sweet
Bicycle Race - Queen
My White Bicycle - Tomorrow
Pop Song 89 - R.E.M.
Nice Guys Finish Last - Green Day
David Watts - The Jam
Take On Me - Reel Big Fish
Suffragette City - David Bowie
Runaway - The Misfits
You And Me - The Moody Blues
I'm Gonna Be (500 Miles) - The Proclaimers
Breakaway - The Producers
What Ever Happened To Saturday Night? - Rocky Horror Picture Show
Can't Get Enough Of You Baby - Smash Mouth
Some music to warm up to and then mostly upbeat stuff to keep it lively. I don't think I'll be riding with music on our morning rides--it's just not our style (although the spin instructor in the group thought it was a great idea). However, I think I'm going to keep the CycleSound on my commuter bike.
A couple of final thoughts. Having the iPod safely tucked away inside the zippered pocket gives a clean look and prevents getting a cord stuck in your dérailleur, but limits your control. I like the idea of a wireless remote control (like this one) for the iPod which would allow you to skip songs, and turn it off without having to take it out of the pocket. Another use would be to turn your CycleSound into a speaker phone with a bluetooth headset (would this work?). I wonder if an iPhone would give you both music and a speakerphone? The mind wanders...