The G1 is an incredible speaker and with out a doubt is one of the best speakers in the world, regardless of price, but as with anything which is a personal choice you need to hear them for yourselves.
As per ported vs non ported bass the Giya's do not have a conventional port, they use a stuffed variable density transmission line tube concept in the Giya series this is the first time employed for bass.
The G1's bass is fast, dynamic, pitch accurate and goes way deeper than listed, I heard a CES demo where the ceiling lights fell out due to the pressure in the room, which was amazing!
The speaker elements are fragile but unless you are very careless, you should never need to replace them.
The cabinet is a high strength composite which is light weight due to the design of low energy storage in the cabinet, rather than using pure mass.