Usability

It's a fairly well-made cable.  The USB connector and the connector that hooks to the Visor are very sturdy and will standup to rough treatment.  My only complaint with the cable is that the Serial  connector is made of two plastic halves that snap together.  This in itself isn't a bad thing, but because the connector isn't made of one molded piece of plastic or hard rubber, it feels a little light and could possibly break (if anything were to break). 

Conclusion

This is a no-brainer.  If you are a Visor Power user like me, you never know where you are going to HotSync.  This cable offers the most flexibility for HotSyncing on the go.  I suppose the only other thing I could ask for (as I am a Prism user) would be a place to plug in my Prism AC Adapter so I could charge and HotSync at the same time without a cradle.  If you're thinking of being buying a second cradle, and aren't sure if you want the Serial or USB version, consider a NxCable-Hotsync first.