I tried it. Sounds absolutely nothing like my voice or my wife's voice. I used the same sample files as I used 2 days ago on the Eleven Labs website, and they worked flawlessly there. So this is very, very far from being close to "Eleven Labs quality" when it comes to voice cloning.
ElevenLabs are based on Tortoise-TTS which was already pre-trained on millions of hours of data, but this one was only trained on LibriTTS which was 500 hours at best. If you have seen millions of voices, there are definitely gonna be some of them that sound like you. It is just a matter of training data, but it is very difficult to have someone collect these large amounts of data and train on it.
The speech generated is the best I've heard from an open source model. The one test I made didn't make an exact clone either but this is still early days. There's likely something not quite right. The cloned voice does speak without any artifacts or other weirdness that most TTS systems suffer from.
Seems to run about "2x realtime" on 2015 4 core i7-6700HQ laptop, that is, 5 seconds to generate 10 seconds of output. Can imagine that being 4x or greater on a real machine