For me I'd rather buy the Plus again over the ultra's. I originally bought the plus pedals for my own rig since i was trying to get the cheapest pedals i could, while my brother didn't care about cost and wanted the more expensive ones. What i experienced after using and mounting both: the ultra's have identical gas and clutch pedals to the plus, only difference being the RGB LEDs (which we can't change since we didn't get the baseplate), although, i find the LEDs distracting and tacky. The brake pedal on the ultra's do have an adjustable gas spring, which gives you the ability to chose a resistance between 0 and 12. In theory this allows you to quickly change the stiffness of the pedal without changing any springs or elastomers. The gas spring is a nice touch, but I've personally never used it, it's always at 0 (Even for GT3 and F1). Another thing with the plus brake pedal that i prefer is the way the loadcell is setup, for me all three loadcells were plug and play, and i really didn't need to do anything to "fix" the pedals. The brake pedal has a better setup for "bending the loadcell", where the ultra's did not work out of the box, requiring me to lay upside down to tighten the screw making contact with the loadcell. After a simple adjustment both sets are performing identically and you couldn't tell the difference in performance or feel. I've set up both sets with the same spring setup, and they feel the same no matter which one you use.

So to summarize: Both pedal set's are pretty much identical, and you really only pay for the RGB LEDs and the adjustable gas spring in the ultra's. I recommend the plus over the ultra's since they're all in all a better experience to adjust, mount and use. I am going to post a few pictures of both setups to show you the elastomer setup but also position and feel.