I've worked on this machine before. Smooth in general makes good machines. The warranty is very nice: five years part warranty tells you that they have confidence in their machines. It's quieter than other treadmills you'd find at this price range, and will last longer on average than a department store model.
Its not at all flashy; there are units on the market from other makers that simulate real world trails, incline up to 40, and in some cases will even function as a tablet (Nordictrack's newer models). This is relatively void of bells/whistles. The console is very basic, almost retro in design. The speakers won't replace your sound system by any means. Heart rate is not entirely accurate, but by brand is a comparatively great guess.
At 2.75 hp, the motor is solid, but not built for a family of marathoners. This is a machine for joggers/light runners who like occasional sprints, not someone training to hunt ostriches with bowie knives. For ostrich hunting, you want 3.5 hp, min.
The 2" rollers are decent. Large rollers reduce heat, friction, overall needed tension, and wear. As with the motor this isn't commercial grade but it exceeds consumer grade. As a rule of thumb you want rollers that, removed from the treadmill, can double as blunt weapons. 2" rollers do have the advantage over 2.75" rollers in this regard; they are easier to wield in a pinch. (**Please do not use treamill or parts as a weapon**)
Maintenance on the machine is essential. Friction will lead your machine to an early grave. You want an enclosed environment for your treadmill, as free from kicked up dirt and pet hair as possible. The part to keep clean is the walking deck underneath the belt. Keeping the side free of debris should do this. I've found some interesting things in belts, from puzzle pieces to starbucks cards; your children will play with this machine. Moral is, keep watch and have it maintained annually.
This is a good machine for people who want to spend a little more for peace of mind. It will not break down unreasonably, as will anything you buy from walmart. It is made of better materials than those in department stores. It will stay relatively quiet. Keep in mind, though, that this is a home machine, and is priced as such. Gym quality machines cost around five times the price shown on this sale, because they are built to take abuse. That said, this machine will take abuse, so your body doesn't have to. Plus, unless you're planning on keeping this at the office and you don't telecommute, you won't have to drive far to use it. Put it next to a tv and watch a documentary on cheetahs, you'll be fine.