It's a good question, and like anything else technology related (specifically talking about the limiting part of a GTIL) the codes and regulations are always a bit behind the times.
Is someone going to come throw me in jail for using a GTIL? No. Could I potentially get fined by the power company if I'm back-feeding into the grind without paying them to let me do it? Could local code-enforcement come tell me I need to remove the solar panels because they were installed on my roof without a permit? Sure, those potentials are always there.
On a broader discussion I think we can all agree that most DIY types have done work "Illegally" by not getting a permit. In my experience most urban/suburban places in the USA don't let you do much of anything without someone else saying it's ok. Electrical, plumbing, new patio in the back yard? Yep - Get a permit. Is it strictly enforced? Not usually unless it's highly visible or someone else complains. I can't even build a small shed on my property without a zoning permit...
But - for sake of this project and specifically talking about the inverter, It's a grey area for me. There are no local codes (that I could find) strictly prohibiting the use of GTIL's. GTI's are't allowed by the power company without going through their application, design and permitting process but again, nothing specifically about GTIL's. The limiting part is why it's a grey area in my mind, nothing I'm doing will ever leave my house. Technically do GTIL's fall under the same regulations as GTI's? Probably, but there's an argument to be made that they don't. Obviously this is an entirely different discussion if we were talking about a normal GTI for which there's no question are illegal w/out the power-company's sign-off.
I'm planning to follow all the normal/official rules and codes for installing solar panels as well as some additional safety measures that have been talked about here to make sure everything is as safe as can be. But if a panel falls off the roof and lands on the neighbor's dog, I fully understand I'll be liable for that.
Having said all that - My official public stance is YES... Everyone should follow, to the letter, all local laws, codes and regulations they're governed by and have a licensed, trained and insured professional do any and all work. Don't buy or use anything not UL listed and wear a condom at all times.
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