I have the Cobra 4, and it is the best machine I've had the opportunity to use over the last ~10 years. Steve's customer service has been excellent up to this point and I've had the opportunity to work with him when he was at Artisan, prior to his starting Leather Machine Co.
You're able to switch between threads, thickness of leather, and tension very easily. Mine does not have the EPS on it, as I do not envision having the need to use that feature.
The Cobra 4 really is easy to use, even for the novice. I put my sister-in-law on it and she was sewing in no time. She had no prior experience with the industrial machines like these.
Depending on where you're at, there may be someone nearby to you that has one of the machines. If so, I'd suggest getting together with them and checking it out.