No doubt their services may be good, but without someone with first hand experience to tell you how effective their service are we may never know until we try them out. I was even trying to check their reviews, they have more positive reviews than the negative reviews, which means everyone who have used their site gained different experience. At the end of the day, we have to be ensure safety because it is our asset that is at stake here.
I think you stated clear points, personally I wouldn't know if there services are good , just as you said someone who had make use of their services can actually tell us how good it is, in this forum, irrespective of the service we need, we should be extremely careful, it is not adviseable for a time to just go into conclusions because may be we have been looking for this kind of services, nah nah, in all this, it is a perfect idea for us to atleast take some precautionary steps for safety reasons.
Funny enough, for you to test their service, you must have to have forgotten and lost the access to your wallet and in recent time, no one wants to intentionally throw away the access to their wallet simply because they want to try out a recovery service without no backup.
These work might get tiring for them if they don’t do or spend more on building reputation and publicity because that’s the two major things they need to be able to scale through in the industry.
Regardless of all said, having to show people on here the result of their previous works will go a very long way to build and give a head way to trust and I will suggest they show their previous works on here.