Stereofan, horns and compression drivers are not for everyone. There are also many types of constant directivity and directed output horns. You then have the common diaphragm materials - mylar, aluminum, titanium, selenium, etc. All have their own distinct characteristics, mannerisms, and sound flavor.
It is not whether a E-wave sounds good or bad, it is whether you like it. For that price, I would buy these KLHs immediately - and I don't paticularly care for the selenium driver. I like and own many horn speakers, but the two E-wave speaker efforts I have heard have struck me as being a bit forward and etched at the top end.
It could be they had not been dialed in, or the driver was a little to hot relative to the woofer, but I could tell where the mid kicked in.
I also don't care too much for the JBL titanium drivers either, so in my case the flavor of the top end plays an important part in my like/dislike of a good set of speakers. I also find some speakers that people swear by leave me cold - ie JBL L100s and Pioneer HPM 100s no longer live here.
If you are worried about $$$, I would definitely listen to three or four horn speakers, including an E-wave, before you jump. You lose money when you join a bandwagon, rather than buying based on an informed opinion.