I have been using a Logitech G302 for a some time now, and even though it is not the most comfortable mouse out there — the prime factor which will make or break the G302/G303 for you — it works for me. The implementation of the AM010 sensor is great, provided that you do not exceed the 2.7–3 m/s (depending on the mouse pad you use) PCS. In regards to the tracking itself, I would describe it as 'raw'; feeling like what would be a modern iteration of ADI's MLT04 (IE 3.0, IMO 1.1 and WMO 1.1). The LoD is approximately 1.5mm on my mouse pads.
One notable thing I would like to mention, is that the G302 (and by extension the G303) has the most satisfying M1 and M2 mouse buttons I have ever used : they are very defined with great tactile feedback. If you like the tactility of Huano switches but find them too stiff, you will love what Logitech has done here. In regards to the scroll wheel, I find it just right — a nice middle ground whereby the notches are pronounced enough for in-game usage, yet not too stiff for everyday bureautique and web browsing. I can't talk much about the scroll wheel click as I never use it.
On the negative side, while I am glad that Logitech did not go for a braided cable on the G302, the rubber implementation here is a bit on the stiff side which might bother some people depending on how you manage your cables on your desk. In my case, I have found a setup by which the cable does not hinder my movements at all using the mouse. Nothing fancy; just running the cable through my monitor pass-through with enough slack in somewhat of an '¬' shape. I have also read online about the mouse having some lateral play due to its diamond shape and mouse feet location as being a downside. I can indeed reproduce this wobble, but it requires me to go out of my way to intentionally to make it happen, so I can't say it's a problem for me.
Finally, in regards to build quality, only time will tell how the G302 will hold up, but my short term opinion is that the construction seems to be overall what you would expect from Logitech — clean and sturdy.
The G302 is not perfect, but the sum of its parts make it my favorite mouse to date. For whatever reason it happens I have better accuracy with it too.
Useful info
• Hand size: 19cm (heel to tip of middle finger)
• Grip: fingertip grip
• CPI setting: 400 CPI
• In game sensitivity: 2.6
• Cm/360: 42cm