There are some pros to this product, but there's a lot of marketing gimmicks going on here as well. I'll reply to a couple comments and then go into detail.
On the question of sterilizing - assuming we are talking about autoclaving then yes some of the products qualify, others are single use
As far as price tag - in bulk (box of 96) a little over 4 dollars each for single use. Reusable $175 each, 165 each if buying a case of 10. The whole "kit" product they are peddling to patients - so for $125 you get a throw away spec, some cheap socks, a little tube with a drop of essential oil, a squishy ball, and a restaurant wet wipe (you can get a case of 24 of the speculums no socks or crap included for the same price.)
I'm slightly confused on the comment of injuring a patient - it's a speculum with narrow bills much like a Pederson or pediatric size model...nothing more...I'll get to the vaginal wall retractors in the "kind" model, but that's not a new invention either.
The "kind" model reusable ( I have one) - It's a polymer construction, better than cheap plastic. They claim no lubricant needed, it's easier to insert than cheap plastic but lubricant is still a plus, just my opinion. The bills are very narrow and fairly long. Fully inserted and fully opened you do get good access to the cervix, the side retractors open simultaneously and push the vaginal walls open. You can take vaginal samples and get a pap smear with no problem.
That said - for play purposes a good grade graves or pederson speculum, metal, medium (or small if needed) is much better suited. You can open the vagina wide, extend the handle if needed for an even wider view, etc. You also have a much more solid device once you lock the thumbscrew in place.
If you have a postmenopausal patient with some level of vaginal atrophy, then the "kind" model is helpful. If you have a patient without major vaginal problems then the metal graves is much better especially if you need to angle to find a cervix that sits to the side or using with a retroverted uterus. The problem with the nella spec is that you can't simply twist to the position or angle you want as you insert, reinsert, etc easily due to the vaginal wall retractors that open up. That said you don't have to twist side to side to see the walls with the nella spec in place. The "kind single use" model is simply the same but you can't autoclave it. The "next" model has a built in upper blade light, material is better than cheap plastic, but it's essentially a basic plastic speculum with wider bills than the "kind" style.
My opinion - it's an interesting product for a serious play doc if you want another very expensive speculum to use in play situations to give the patient different sensations, same as using various models that have long been available. For professional medical use...seems more of an emperor's new clothes kind of thing. The whole idea of a patient buying the "kit" and bringing it to their doctor for comfort - just find a doctor who knows how to gently perform a non rushed exam. If you see a doctor who gives rough exams this isn't likely to change things and may make the exam more uncomfortable in the hands of a doctor who is rough to begin with. Go somewhere else. Buy a really nice bottle of wine and chocolates for the $125 price tag. For play - find a play doctor who actually knows what they are doing and has a collection of various speculums to begin with to make things as gentle or as uncomfortably erotic as you want. Problem solved.