Senko 4" is very versatile. It's round throughout so there's a lot of plastic in a bait...that makes them Heavier than say, a similar-sized Carrot that Tapers, but yet, the Senko isn't as Thick 'n Chunky as the Wutz-Its, so they cast quite easily Weightless, but their Volume isn't so much that it would hinder the Hook-Set...even better-yet when shot in Soft or Super Soft.
I see a LOT of applications for the Senko 4", in Freshwater and Inland/Coastal Saltwater.
I like Soft and Super Soft in most-everything I do (nowadays...but there are Exceptions to that Rule, of course). As a Twitch/Jerkbait, there's a distinct kick/wiggle through the rear-half (Soft or Super Soft). The Front of the Senko is Flat so it pushes a little water...this does a few things...1, it lets the bait stay higher in the water with less speed, and 2, encourages a Side-to-Side better than a Pointed Nose, which, in-turn, also produces more "kick" on the twitch which will actually Thump as it kicks and initiates the wiggle.
AND, because it's Round, You have a lot of Area for Rigging...You can turn it and stick it again if You just need another spot to Skin-Hook, like a Tube (Laminates can be at a disadvantage here).
.A.W.E.S.O.M.E.
