I bought my Zealot paclite Gortex jacket back in 2006, carried it on my PCT thru-hike in 2009 and am plannnig on taking it on my AT hike starting next month. For me, its held up well though I'm pretty good at taking care of my gear.
How I use it is one of the reasons I don't feel wet when wearing it in all day rain like most people do wearing most rain jackets, pit zip or not. I often don't zip the jacket up. I use the sternum and hipbelt strap of my backpack to hold the front closed which allows for venting of the body core.
I'm kind of in between a medium and a large so what size of shirt I buy depends on the brand and model. I bought the large size (7.8oz) and found that I have no problem with the fit. And there is still plenty of room for a lighweight fleece or lightweight down jacket (<8oz) layered under it.
I'm sorry that OR no longer makes the Zealot as I'm not that happy with most of the new jackets on the market and I suspect that by the time of my CDT thru-hike in 2015, I'll be needing a new one. If it isn't lighter and as durable and functional, its not an improvment.