Alchris Audio TX5s

I'm curious if anyone here has experience with the Alchris Audio TX5s or other trasmission line speakers. I'm interested in checking them out as an alternate option to the traditional 2-way ported bookshelf speakers I'm considering. I'm looking to upgrade later this summer / early fall and just curious if anyone enjoys the sound quality and sound stage. 

If you have experience with transmission line speakers, what do you like / not like about them compared to traditional ported bookshelf speakers?