I've had a few pairs of zip waders and like the versatility and comfort they offer. My previous pair disappointingly lasted less than a year before the zip broke and the booties started to leak, so I decided to try a different brand this time around.
Now I do use my waders a lot and am quite demanding of them so I need a pair that will be durable and reliable, but I refuse to pay £600 - £700 plus for a top end pair that I could ruin on barbed wire on their first outing!
I settled on a pair of Redington, Sonicdry Fly Waders. These do not have stitched seams, they are ultrasonic welded, and are very well made, thick, tough and with plenty of storage pockets and even fleece lined hand warming pockets, a real bonus for winter fishing. A very substantial belt is provided and the waterproof fly zip (manufactured by German company, TIZIP) is flexible and easy to use.
The waders are roomy and comfortable with plenty of room to bend and stretch. My one criticism is with the neoprene booties that are somewhat snug and I would like them to be a boot size bigger.
So in conclusion: Redington Sonicdry waders gets the thumbs up
One word of warning with zipped waders - From experience, always check that the zip is done up before getting in the water!!!!