I'm on L1. Worked in Canada for 2 years. The interview was so short. As long as the company is legit and you don't have any bad records on you it's fairly straight forward. You do have to write why your knowledge is specialized though and no one else can do it. For me I wrote about the internal systems that I had a deep understanding and some I wrote. Someone else would have to train for at least an year to do the same. The lawyer sprinkled the jargon but that was the gist.