I own a pair of these; I also own a pair of Nikon Aculon 7x50s. I picked up the Celestrons after owning the Nikons because I host community events and wanted an extra pair to hand to other people's kids. I also wanted to know what to recommend for beginners.
The build quality is good (nothing rattles, and collimation is tight across the range), and the image sharpness is fairly crisp at the center of the FOV. However, they suffer from significant vignetting, and the image quality suffers considerably along the edges (with only the center 1/3 circle being crispy, and the outer edge being downright blurry).
In comparison, the Aculons are slightly brighter (if at all), but the image is sharp and consistent across the entire field. (Nikon claims they use aspherical lenses to achieve edge sharpness, so that's what the extra $70 buys you vice the BaK4 prisms IMO.) The Aculons are more forgiving on where I place my eyeballs (whereas I have to fiddle with the Celestrons to optimize the placement of the exit pupils). The Aculons are longer and a bit heavier (900g vice 765g for the Celestrons). The Nikon case is padded. And the Aculons come with dust plugs (vice caps) that don't fall off the objectives.
I spend most of my time using my Nikon Action Lookout II 10x50s, so I'm not all that vested in which of the 7x50s is better. If I only had $30 to spend, the Celestrons are the only choice. But if I only had $100 to spend, what I bought would depend on how I planned to use them. If I were buying for a Cub Scout troop, I'd buy 3 pairs of Celestrons. If I were buying for myself, I'd get the Aculons.