Unfortunately, the quote is inaccurate.
Laser sensors, and specifically the most popular laser sensors like the Avago ADNS 9500 suffer from negative acceleration on most cloth pads (like the Steelseries Qck). This is not something subtle, but quite noticable. It will be more noticable by low sensitivity gamers who do frequent large sweeps with their mouse, which really exposes the problem. The problem is made worse because the acceleration is inconsistent, and as a result you can not really ever get used to it. This is a problem I have been able to (easily) recreate.
The positive acceleration is not as obvious. People say the sensor has slight positive acceleration on hard pads. But it is so small that it is hard to recreate with a simple test. However, it is a well-established issue of the sensor and some people have tested it extensively.
So what are the advantages of laser sensors? There are a few. First of all, the new laser sensors allow for a higher DPI than any optical sensor available. You do have to wonder though, who really needs 8.200 DPI. Especially when the top players in the world in games like Counter Strike: Global Offensive use something closer to 800 Dpi, and this extreme high DPI is not really used by anyone. It makes you suspect that it is just a way to put even bigger numbers on the box, similar to 1:1000.000.000 " dynamic contrast" on monitors .
The second advantage is that they can have a higher malfunction speed. This means that you can move the mouse faster while the sensor keeps tracking without skipping etc. However, the maximum tracking speed of the better optical mice is already enough for even low sensitivity gamers. And if you are a low sensitivity gamer (who tend to do longer and faster sweeps) then laser sensors are not as interesting anyway since previously mentioned inconsistencies in sensor performance are amplified.
Another real advantage is that manufacturers use more laser sensors than optical sensors in newer mice. Going for a laser sensor therefore gives you a lot more different mice to choose from, though you are also often forced to use a hard pad.
Then what are the advantages of optical sensors? There are a few. This is not so much about the technology of the sensor, but more about the way the sensors that are out there behave. There are optical sensors available that have no acceleration problems. Like the ADNS 3090 (though annoyingly, not every 3090 in every mouse, since manufacturers have their own versions), the S3668, S3888 and 3095 in mice like the G400, WMO 1.1, Deathadder 3G& 3.5G some of the Zowie mice etc. This is important to a lot of people, since the accuracy and reliability of the sensor is often the reason why people will get a gaming mouse. Typically people who play arena twitch shooters for example, will go for these kind of mice. People who emphasize other features, such as number of buttons available, will get mice with inferior sensors since this matters less to them (for example, the Razer Naga is very popular, but uses the Philips Twin Eye, which most FPS gamers will avoid).
Another advantage is that optical sensors have less tracking issues. Which means that they can typically be used on different types of surfaces. However, this does not mean that all optical sensors track well on anything. Some, for example, dont track as well on multi-colored surfaces etc. It is always best to do a little research on the specific mouse and sensor you are going for.
There is also the issue of prediction. Not everyone is really bothered by it while some wont even consider a mouse with prediction. There exist both laser and optical sensors with and without prediction, and newer sensors more often that not eliminate prediction. This does not really affect the whole laser vs optical thing, but I thought that maybe I should mention it.
Generally, what it comes down to for me is what kind fo features do you want in a gaming mouse, which is probably dependent on the type of games you play. It is generally hard to recommend laser over optical based on the quality of the sensor alone. But a mouse can have many other features you may care about (like shape etc.) that can tip the scales.
Edited by kazuyamishima - 2/20/13 at 9:59am