I bought this bike a couple of weeks ago for $275 (with RC discount, $290 is usual price) and have since put about 250 miles on it. Just like any department store bike, it's not the best in the world, but it's the best sub-$300 new bike option, IMO. At its current price, it's a really good deal. At the time of this post, there were still some available for shipping and of the 6 stores near me, 5 have them in stock for online order and in-store pick-up.
I'm transitioning from a halfway decent mountain bike to road/hybrid and tried Walmart's GMC Denali road bike ($170-180, depending on frame size), Walmart's Schwinn Dodger hybrid ($250), Target's Schwinn Solara road bike (currently on sale for $150), and Dick's Sporting Goods' Nishiki Manitoba (on sale for $350). I decided I didn't like drop bars and none of the "road" bikes were geared as proper road bikes, anyway. The Dodger is also really heavy, but it comes with disc brakes. The Nishiki is quite a bit more expensive, but comes with the (slightly) upgraded Acera groupset and doesn't have disc brakes.
The Circuit seems right for me. I replaced the seat and pedals with those from my old bike and added some $10 bar ends from Amazon to give me some different hand positions during long rides, but that's it. It feels as light as hybrid bikes in the $350-400 range. The groupset is all Shimano Tourney (ie. the cheapest one Shimano makes) and the mechanical disc brakes don't have any brand on them. The pads squeal, but work well. 32mm tires are decent with some tread. It's got braze-ons for 2 water bottle cages and a both front and rear cargo racks.
I'm 6'0 at 225lbs and it fits me. I'm at the top end of the height range (seat post is just about max height), so I wouldn't think it would fit someone much taller.