I did use Dot 5 in the ‘80’s but went back to using racing brake fluid (Dot 4) because of the following issues.
1. Silicone brake fluid entrains air bubbles easily when pouring and or maintaining the system and produces spongy feeling if not properly handled.
2. It doesn't absorb water, so any water that gets into the system accumulates in the lowest point stays there and causes rust mainly at the wheel cylinders and/or calipers which may cause seal failure at that point.
3. Some silicone fluids have additives that can vaporize at moderate temperatures, increasing the spongy feel in some instances.
4. Silicone fluid is incompatible with systems that have held glycol-based fluids for any length of time, require total rebuild of the brake system. Flushing and seal replacement can be done but extreme caution must be used when performing this task. There are other opinions on this which state that the modern silicone formulations are compatible with only a flushing and a complete reseal is not necessary (The actual DOT specification requires chemical compatibility so the two fluids won't cause reactions if used in the same system, but they certainly won't mix, either…You decide, it’s your car and possibly your life at stake here).
In closing, it might be fine for some people to use this fluid but do you really want to risk it all just to use a fluid that won’t damage your paint?
Most serious racers use this fluid
Castrol SRF