I guess there's little interest in this subject, but, since I started this thread I'll wrap it up.
I ended up purchasing the Sleek based upon my conversation with Wilson Tech Support. Here is a before/after of the Sleek operating at my home.
I set the magnet-mount antenna on a metal bowl on my window stool, about 8' away, and powered it off of my desktop computer USB port.
There were NO issues related to antenna separation and feedback/oscillation
Note the "RX Signal Strength" and "RX Power".
Booster off
Booster on
And sitting on my desk, landscape mode.
