Hi Steve,
I havent stripped the new Magseal but I have worked on many Saltiga's/Dogfights...
One of the main points of difference is the way the Oscillation works; Daiwa use a geared system (also in the new Catalina) - which is similar to the system used in the Saragosa.
Pic below of a Dogfight internals
The Oscillation slide is supported by 2 bearings, one at the top and one at the bottom as shown by the white circle, the gear turns when the handle is turned causing the spool to move up and down via the oscillation slide. When the spool is under load (drag engaged) the shaft is trying to turn clockwise (looking from the front)...the load is basically transferred to that bottom bearing in the white circle - the top bearing at that time has no load and becomes almost redundant.
In the case of the Saragosa I have seen where the combination of load/tolerance has caused scoring on the oscillation gear or scoring on the lip where the bearing runs (not all reels, maybe 3 or 4 over the last year)
If you take a look at the Stella design it uses a slide system supported by 2 rails
Just my opinion only, but I believe this offers better support due to the design, when you take the same scenario (drag engaged) the load is supported at both the top and bottom...
In regard to the other design features...digigear etc is all well proven and should be even better in the latest designs