First time I heard of Seletron. I went over and reviewed their web site.I believe Seletron offers one called the EVC Sport.
First, Seletron is an Italian company and it appears that their main forte is as a manufacturer of tuning kits for cars. They have various chips for various cars. From what I have been able to find, everything I read is pretty positive.
One unique feature that I found to be excellent is that their tuning kit does not replace the car's ECU. It is installed near the ECU and it intercepts the signal cable coming into the ECU then outputs a modifying signal back into the ECU. Their tuning chip makes adjustments to fuel trim, turbo boost, etc. One reviewer says easy to install and no warning lights, etc. All indications are this is a quality product.
It appears that their exhaust controller works similarly. That is, the signal to/from the car's ECU is intercepted allowing the driver to manually control the exhaust valves or return control back to the car. Very slick solution. Their controller cost € 399 ($446 at today's exchange rate). The Forza controller costs € 264 ($295).
From what I can find out, Seletron products appear to be good quality, they have good reviews and would likely satisfy Alfa owners. So, it appears that we have two choices for exhaust controllers and a new player on performance enhancements. I particularly like the fact that their products, like the Forza controllers, are plug and play and you can easily remove them if you need to take the car to the dealer for warranty work.