I have had my Atlantis 4 suit for 2 years now and it is the best piece of kit I have ever had.
EVER so comfortable and fully waterproof!! BMW say it can be used in the summer but I find it too hot if the temp gets above around 22c. and I then use a lighter shell or a mesh jacket if it is really hot.
It is expensive, but worth every penny in my opinion.
I,ve had my Atlantis 3 jacket and trousers for 7 years and it,s been brilliant .
I did have a problem with the zipper on the jacket and had it replaced a year ago , When it,s worn out in about 10 years i will replace it with another one from bmw .