JK has a good reputation and very good service. The Quicktap looks good. The only issue you may have is the local phone (you talking) may be louder than the received call like you described in your initial post. But, probably not as soft as you described. This is common in less expensive units. If you have an audio editing program with noise reduction (Apple Soundtrack Pro, iZotope RX, etc.)you can eliminate a lot of the background noise that comes up as you increase the gain.
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.5 QT7.5.5 Kona 3 Dual Cinema 23 ATI Radeon HD 3870, 24″ TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 2 (FCP 6.0.5, Comp 3.0.5, DVDSP 4.2.1, Color 1.0.3)
Pro Tools HD w SYNC IO, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN