I've heard of them... quite surprised to see them try and promote themselves here though. In terms of Southeast Asian providers, they had the best streams in a region where broadband isn't widespread. Early adopters of live streaming (Asians prefer live online gaming from accredited physical casinos, who trusts RNG, right? Haha). They're ubiquitous in Southeast Asian casinos, but unfortunately, are used by quite a lot of scam casinos (in my experience, getting a lot of spam in my email from a new pop-up casino every now and then). Their dealers are quite popular, Philippine-based all of them as I recall.
SoftSwiss may be one of the largest/most popular providers out there, but by no means the only one. Most full-fledged casinos will have at least five or more providers these days, especially those really popular slot-casinos you see people playing on mobile/tablets now. Oh, and SoftSwiss didn't have live dealers... or do they now?