The camera's lens is hidden under the slide mechanism when not in use which helps to protect it from scratches. It has a large and serviceable self-portrait mirror, but no flash.
As sliders go the SGH-J700 is a neat and tidy example. It weighs 92g which shouldn't trouble your pocket. At just 15mm thick and 48mm wide, its 99.5mm of height are the only real let-down. There appears to be a lot of unused space above and below the screen which leaves you feeling that maybe Samsung could have shaved off a few mm of height. When opened the phone is about 135mm tall.
The slider mechanism itself is smooth but there is nothing to push or pull against on the front fascia to open and close the slide. So you are left either thumbing the screen which can cause a grease problem or using the navigation wheel or lower buttons for purchase which can cause unwanted selections to be made.
The numberpad which lies under the slide is flat, its keys separated by very low raised ridges. They keys are large and I didn't find using them a challenge. With the slide closed you have a fairly standard arrangement of front buttons. The two softmenu keys are round blobs that sit either side of the navigation pad. They don't look very pretty to my eyes, but they work well enough.
The navigation pad itself looks as though it should be one of Samsung's wheely specials - the kind you can rotate under a finger as well as press up, down, left and right. But only the latter functions are supported.
Beneath the navigation pad and way too close to the bottom of the handset for my personal taste are the Call, End and cancel buttons. I tend to find buttons so close to the bottom edge of a mobile's front fascia a little awkward to use at times.