I have both Pro panels and Helix panels. Personally, I like the pro panel much better. Many reasons
When I got my helix, I had to offgas for about 4 and a half weeks, full power hanging out in my garage. PAIN IN THE BUTT!!! (Also, they didn't tell me they had to outgas. So it took me more than a month before I could even use 'em!)
Helix panels are completely sealed, but they use a latex/silicone blend caulk. This doesn't have but maybe a 15 year life. Pro panels are warranteed for 10 years, vs 3 on helix.
I have never heard of a pro panel deteriorating. It's made out of a plastic sheet surrounded with sheet metal! Tell me how sheet metal (aluminum i think), when painted and sealed with a high gloss paint, can deteriorate? Or how plastic can. From water and heat, mind you.
I have only had my panels in for about 4-5 months now, but they both work equally well. The helix panels really piss me off with the lip, however.
And as chris said, you get much better support with the pro panels. along with good tips for building your cage.
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-Chris
0.1 Licorice Stick Black Rat
1.0 Black Rat
0.1 Vietnamese Blue Beauty
1.0 Green Tree Python
0.1 Texas Bairds Rat
The educated are the few. The uneducated are the masses.
North American Rat / Corn Snake Care Sheet