Whatever rain suit you buy, make sure you try it on first.
By that I mean over ALL the gear you may ever wear. A lot of riders don't do that only to find out it won't fit comfortably over heated clothing or leathers. Then, if possible, go and sit on your bike or a similar one on the dealership floor. Make sure the sleeves don't pull up or the shoulders don't bind. Check to see if it fits tight and snug when seated. This is important to avoid letting wind in at the waist which causes the balloon effect and lets rain in. I've seen riders with bungee cords around their waist trying to get it to seal. Try it on with your helmet, gauntlets and boots to make sure they fit too. Sit on the bike in a riding position with your feet up and crank the bars back and forth to check for comfort and binding, same with your head. Make sure the helmet chin strip doesn't bind on the collar. Then ask yourself if you can ride like that in the cold driving rain for 300 miles. If the answer is no, try on another suit.
I use the HD Overpass suit. I like it. My previous suit was a motorport.
Mark