This is the model that interests me, the Westone "Mulitpurpose Style 40", NRR of 29, and an average attenuation of 40.
Are you planning on using them with a communications system? NRR of 40 might be too much.
I've got a pair of custom-molded plugs (i.e. no speakers) (not made by Westone) which are uber-comfy. I use them on the long intercontinental flights (or when riding with buddies who snore). They attenuate more than the 34db MAX Leight's, which means I cannot use them with Sena speakers - they simply block too much noise. I cannot understand people when they talk to me, other traffic, and barely even the Highway blasters on my own FJR.
I have a box of Flent's Push-in earplugs which attenuate at 19 db. That's about perfect to use with the Sena's, but it does let a fair amount of wind noise in and I cannot use them with some helmets, on long trips, or with the stock FJR windshield.
The reason the Style 49's are so appealing is that they promise to block the harmful sounds while allowing the "good" ones, i.e. people talking etc. I'm just debating if it's worth $190 ...