UPDATE: my first test on the power reserve is surprising - 80 hours! I'm checking again, but that's very long at over 3 days. Most of my mechanicals are 40 to 72 hours.
I have a healthy collection of quartzes, mechanicals, and automatics from Bulova, Citizen, Hamilton, Seiko, Tissot, and a couple of micro-brands with a mix of Chinese, Japanese, and Swiss made watches. This Singapore made watch is half the cost of a Chinese made Tourbillon mechanical and cheaper than almost all of my quartz Citizens. I never heard of Ratio and I honestly would never had looked at it much less purchased it if I wasn't a Vine reviewer. To cut to the chase, this is an excellent watch for a shockingly low price. This is easily going to be one of my favorites and go-to divers (I have 7 others).
This watch scratched a few watch collecting itches: an automatic diver, >300m water resistance, a Seiko movement, and a strong and long lasting lume. And it comes with a sapphire crystal to sweeten the specs. All my other divers were quartz, 100 or 200m WR, with weak and short lume times, and mineral crystals. Feature and price wise, this watch crushes the others.
Here's how the watch actually wears and performs. I have an 8 inch wrist and this is definitely a big boy. The case diameter is 46 to 48mm, depending on where you measure and what bumps/bulges you hit. Lug to lug is 50mm and the lug width is 24mm. Case thickness is 15mm. The silicone strap is beefy and thick at 5mm, but it remains pliant and is comfortable to wear. However, I am surprised the band isn't longer for such a large watch that would be best worn on large wrists. I only have one spare hole left. Another possible negative is that the inside of the band has a texture to provide extra grip to prevent the watch from sliding around, which leaves indentations on your wrist. So, I may replace this band for something longer and that doesn't leave impressions on my skin. The buckle is brushed and has a tastefully displays the RATIO name.
The case is hefty and the bezel is beefy. I like the uni-directional, ceramic bezel with large and legible numbers. It has 120 clicks vs 60 on some of my other divers. The markings are spot on and aligned perfectly. The edge serration is sharp and easily gripped for turning the bezel. There doesn't seem to be any anti-reflective coating on the sapphire crystal. The back is a screw on with an image of a scuba diver, which is pretty neat. The dial is the standard diver type with big bold circles at each hour except 12, 6, and 9 which are trapezoidal. The day and date are surprisingly easy to read. I like how the hour and minute hands have different colored edges to help with reading the time. There's a lot of lettering on the dial, but it's all informative. That symbol above the RATIO name is the symbol for Pi. Yeah, this scratches the math nerd in me - "Pi Ratio" is perfect for a circular watch case.
The lume was a big differentiating feature, surprisingly and shocking bright at the beginning and amazingly still readable after I stopped timing at 20 minutes. ALL of my other watches become unreadable or flat out dark after just several minutes.
As for the movement, it tested at 21,600 bps with +8 seconds/day and a 0.4ms beat error. The power reserve timed in at just over 46.5 hours, a few hours over spec. So the Seiko automatic movement is pretty decent overall.
These features I could not realistically test - the 1000m water resistance and the helium release feature. I am a desk diver, will never go deeper than the diving well of the community pool, and will be in a decompression chamber. But I like how the crown and the helium release securely screw down to keep out water.
Overall, this is a lot of watch with many features and specifications for such an insanely low price. The value here is real and this watch packs a punch way above its price. However, I wouldn't recommend it for those with wrists smaller than 7 inches as this is definitely a large watch. But you (and I) should check out other watches by this brand as it seems to deliver the goods for very reasonable prices. I'm seriously considering the red version of this watch.
I give it an overall 4 stars, but that's very good considering my initial expectations was 2 or 3 stars. I can't really say it's a great watch that'll become an heirloom piece that's worth regular servicing. But for a very inexpensive automatic with lots of neat features and functions that just looks great and will last for at least several years, then it's a no-brainer. And also if you're wanting a dressy Tonneau style watch and you have a larger wrist.