I'm with the majority here.
I have had my Diva for over a year now and completed around 50 dives with it so far
love it love it love it.
It is so comfy with the padding and lumbar support. Yes the lack of front strap also gives a feeling of freedom whilst remaining secure. I love the adjustable cumerbund as I am a bit on the skinny side, so to actually feel a bcd snug around me for the first time ever was and still is a rare treat.
If you buy a new one, you will also have the surelock attachment for the weight releases which is a definite plus, as I am very aware of the potential for the velcro wearing loose.
Thanks for the warning too Iani, it reminds me, mine is due for a service round about now, so I should take heed.
I have just had six weeks of solid diving and did not experience back pain or problems once, which I am sure is completely down to the balance and support of the diva jacket.
I know what you mean about the packing thing, but as this was my first owned bcd, I did not know otherwise, so am just used to the bulk issue now. I just have to take less clothes!