Sorry it took me so long to get back to this thread to answer your question. I did hear the demos and after shoving them into my head as hard as I could to create the best seal I could, I liked it enough to make the plunge.
I just got my JH5 yesterday and I will say they are super cool. First pair of custom IEMs and I'm pretty stoked. After listening to them, I will say that they are as different as the Shures as you can get. The Shures are extremely smooth and liquid with a strong forward midrange presentation. The JH5 are airier in the treble region with punchier bass. I think the Shures have more bass quantity, but the JH5 have more bass impact. Where the Shures have an emphasis on the midbass, I feel that the JH5 are more balanced with a touch of warmth.
Unfortunately, the left monitor ended up hurting my ear after an hour of listening, so they look like they'll have to be sent back to JH to be remolded. I thought I was going to be different than everyone else, but no such luck.
Lastly, the famous JH customer service. When I first contacted JH Audio regarding their sound signature I was emailed back by Jerry himself to tell me the difference of the line up within several hours. Still on the fence they offered to ship me a pair of demos (on my dime) before I made the purchase. Very impressed! Then when I made my order I was going to also order a pair of their musician plugs as I am a shooter and would love to also have a pair of custom made ear plugs. However, they were initially $50, but when I went to order they were $100. I called Brittany to ask about the price difference and to this day have not heard back yet.
EDIT: I shipped out my headphones on 10/6 via priority mail and they are now returning them back to me 10/8. They basically took care of it the same day the got the package. I included an extremely in depth description of what was happening with the headphones, so I will update this post the second I get them.
EDIT 2: Well just got them back in the mail. They were nice enough to ship it back to me via 3 day select via UPS. I popped them in and they are much better than before. Perfect? No, but pretty darn close to the point where if they messed with it, I think it would get worse than better. So bottom line. I have no regrets and no buyers remorse, they look and sound fantastic. So if you're on the fence. Just buy them. Other than getting customs to fit being a pain in the neck it is worth it at the end.