@RobinStrike thanks for the nudge!
I have used it and always intended to return with a review but a couple of things have got in the way.
But as I'm here now, I'll write a short update.
The Issviva comes smartly presented in a satin pouch and presentation box. Mine also came with a tube of lube and some sachets of 'intimate wipes'.
It requires an initial charging and is then good to go.
The device is bigger than I expected, and entirely rigid. This means it is bordering on uncomfortable for me, I sort of wince at the point of insertion, but it's OK if I relax.
The experience itself is fine: you just activate the vibrations and the lights prior to insertion, and then lie back as it does it's thing. I'm aware of something doing something in my vagina, but it is very subtle. By the time it buzzes to signal that the session is over, I've usually completely acclimatised to the sensation.
I've experienced improvement in my pelvic floor weakness (a sense of heaviness and fullness) while using the Issviva, but I can't say 100% that it's definitely down to this particular device; I have also been using the Perifit (which I bloody love!), lost 2 stone, began using Estriol cream (inserted into my vagina) and built pelvic health awareness into my exercise routine, so I feel like the relief of my symptoms might be due to a little bit of everything.
After using the Issviva for the first week, I did experience a faint bleed in between periods (which are sparse anyway as I'm perimenopausal), so I took a break before starting again. This has happened one more time since, and I took another break before resuming.
I have also had two bouts of thrush in the last 6 months, which is sort of the time since I began to use both the Issviva and the Perifit. I'm not sure it's down to those devices, seeing as I am meticulous about hygiene (it is very easy to clean, luckily), but it's meant that I have discontinued use while treating the thrush.
So, not a conclusive endorsement, a couple of question marks and some patchy use, but overall, I'm glad I bought the Issviva and will continue to use it.