DIY speakers should be tried if one wants to do something on her/his own.
I wanted to have a speaker of my own considering the limitation that I can not make a driver.
Just like the fact that I wanted to do trekking, then mountaineering, just like I wanted to create my own images.
Just like the fact that I had to do all these because they are possible, because they are there.
Listening to a speaker made by self is an experience worth your own appointed value.
Do not ask people about its worth.
It will come from within.
I also feel, if the speakers are to be made for self, then measurements are to be used for guidance, ears are for acceptance. Ratio of 20:80 should be followed here (IMO). In fact I never measured my speakers by tools. Because I could not measured reproductability and reproducibility of man and machine for those measurements. Who knows how much error those machines have. If the speakers are for self, let me be the man and machine for that.
Instead, I invited friends like common man, musicians, composers, singers, someone who runs big shows, repair costly amps. Based on their ear, listening experiences they rate (qualitative only) my speakers. I, listening their impressions cross checked what my ear listened and retune my understanding of sound accordingly.
I have various string instruments and percussions at home, I play them and listen to others played through CD or some sources. I measure accordingly.
I regularly go to open ground live shows where music is amplified through JBL or such speakers. I remember the sound, cross check with mine at my listening room. I also regularly attend cultural get-together and listen vocals, percussions, strings (mainly classical guitar), drums. I try to remember them and check then accuracy of my speakers. Compare my DIY speakers and branded ones for the same song.
If you do not want to die wandering for what if, try DIY.
If marriage like a DIY can be a success, anything else will.