Disclaimer: While I have used a great variety of keyswitches over the years, I'm not the best with the related technical terms. As such, this review will be based solely on my own subjective personal observations. I am not affiliated, other than as a highly satisfied customer.
I ordered and received a full-size Quiet Pro. In my opinion, it lives up to its name. It is definitely the quietest of Alps switches. I am a longtime user of the Apple Extended Keyboard II, and that would be the Quiet Pro's closest relative. No, it's not silent, but then, what fun would it be to type on a totally silent keyboard? I'm certainly not complaining. The switches are undeniably tactile. They have a pleasant weight. I can rest my fingers on them without fear of unintentionally pressing a key, and yet I can type for prolonged periods without tiring. My accuracy is greatly increased, compared to my previous board, a Topre Realforce 45g uniform board.
How does it compare? I must start by saying this: I got my Realforce in July, and have used it exclusively until the arrival of the QuietPro. With the Topre board, I find that I frequently hit extra keys, and do things such as activate Caps Lock when I am aiming for the letter A. At first, I attributed this to being unfamiliar with Topre keyswitches, and figured that the remedy was to use it exclusively.
Months later, my accuracy has improved only slightly. During my first 5 minutes with the QuietPro, on the other hand, I saw that my accuracy was spot-on, and that my typing style was not the problem here. The QuietPro is MUCH more tactile than my 45g Topre board, and that is most likely the main factor. However, I am also wondering if the increased weight is also a factor. Eventually, I intend to get a Cherry black board to test that theory and see how much the weighting is a factor, since Cherry black switches are heavier still.
When I was getting my Topre board, I opted for 45g because it was supposedly the same as the vaunted HHKB. Now, I am wondering if I would have been happier with the 55g Topre, which I hear are more tactile than their 45g brethren, but I do not have the means to find out, and don't intend to do anything with my 45g board on a gamble. While I love the Topre "thock", I have to say, I love my QuietPro's accuracy FAR more. The QuietPro's sound is also a pleasure.
All in all, I am very pleased with the QuietPro, and do not regret it in the slightest. I highly recommend it to anyone who wants a great typing experience. I can't address how well-suited it is for gaming, as I am not a gamer. I am sure there are those who will disagree with my assessment, but for me, the QuietPro is the perfect keyboard. Kudos to Matias and their development team!