Hello Grateful,
Sorry, I have not been on the Agon for some time, so I am not sure if I have ever answered your questions or not...
Just in case I have not, here goes.
While I can give you an answer regarding the TLS vs. an Electrostatic, it would just be my biased opinion, so I will allow others to comment on this.
The TLS Family of speakers are extremely easy to dive and represent almost an entirely resistive load to an amplifier. They have very low inductance and almost ruler flat impedance with as little as +/- 1 ohm across their range, with the exception of a high thin peak at resonance.
Your Atma-Sphere amps will drive the TLS-4, 5, TLS-1 Hybrid and TLS-1. Your amps are too small for the TLS-2.
However, I do not recommend less than 100 watts for a shoe-box, as head room is everything, so they may not achieve full capabilities.
The TLS Family is quite tube friendly and demand the best of SS or tube equipment.
I will be brutally honest and tell you that our speakers are not forgiving, and will not turn a Pigs ear into a silk purse. They are extremely revealing and will let you know if you have a poor recording in a heart beat. Or, poor equipment.
They will also spoil you and once you have heard them you will not be able to go back to listening to standard speaker. This, ...not from me, but from 100% of our client base.
Hope this helps.
Great listing to you.
Dale Harder
HHR Exotic Speakers