All of their reels are basically the same design. The major differences between the models are the materials used and the bearings. Basically lower end is aluminum frame with graphite side plates and basic stainless steel bearings. Upper end has magnesium components with ceramic bearings. With the original Concept reels the side cover came off to adjust the brakes on the spool. Of course you could drop the cover and lose it overboard. The newer Concepts have a "Beetle Wing" design where the cover springs open on a shaft and pivots out of the way. No more lost covers. This new feature raised the price about $10.
The Inception uses the original cover design, more brass components (cheaper material than Duralumin and heavier), and "lower" end stainless steel bearings. The design is the same with the same brake system and spool. It feels the same as the A, C, and E models. Their aftermarket parts also fit this reel if you want to customize.
So far I have an E and a C. I use the E for T-Rig and light flipping. It is the only reel I have used without a magnetic brake that I can adjust for flipping without overruns.
My personal opinion, if you only fish freshwater the E is over kill. I got a killer deal on an E but all my future purchases will be the C.
2012 Skeeter ZX190
2012 Yamaha 175 HPDI