Just my $0.02...
I have not used the Jessem fence but I do have the Incra/Jessem Mast-R-Lift (with a PC7518), which is essentially Jessem's lift with Incra's rare-earth magnet ring retaining system. Personally I like the magnet system as it doesn't require a special tool to remove and replace although it does take a small screwdriver or brad to get the leverage to break the magnetic attraction. That said, I have nothing but good things to say about the Jessem lift and I have no reason to believe their fences are other than top-quality.
For fences, I purchased and installed the Incra LS25 with the Wonderfence this summer.
I have used it for creating dovetail drawers and some trivets that requires some very precise, repeatable cuts in addition to miscellaneous work. I have not used it with raised panel bits to date.
Please run what I'm about to say through your own "filter", since I'm comparing the Incra fence I'm intimately knowledgeable with the Jessem color brochure pictures, so I may make a misstatement.
What the Incra does an excellent job of providing is a highly repeatable fence system with very precise offsets from your choice of reference position. If you initially adjust the fence to where the edge (or center) of a bit is precisely adjusted to the edge of the fence, you can move the fence a precise offset from that position and then return it precisely where it is. Any error you make when initially aligning the bit with the fence will be precisely and repeatedly misaligned, and you will complain about the Incra.
For a particular bit, when blind cutting dovetails, there is one and only one height of bit where you will end up with the correct tightness of joint. This can initially be approximated but typically takes a couple of test cuts in scrap to get "perfect". If you do not do this, you will complain about the Incra.
In order for the pieces to go together with the edges precisely aligned (without requiring trimming), the piece must be precisely centered. There is a process for doing this that requires 1 piece of scrap the same width as your final material. If you do not do this... you get the picture.
Once you are set-up the Incra permits you to make many types and sizes of joints without requiring additional pieces.
For other fence use, it is a dream. Its easily adjustable in 1/32" increments with a toothed-offset mechanism and continuously adjustable using it's calibrated know in thousandths of an inch (much more than is needed for anything except centering, in my experience). It is also much stronger than it may appear. The Wonderfence also makes jointing easy because it has sliding wedges you can use to adjust the offset of the infeed from the outfeed. This is convenient.
The strength of this fence is also its disadvantage. It has a long depth-adjustment bar. This permits you to make cuts offset about 2 feet from the bit. During that time, however, the bar sticks the same 2 feet out the back of the mount. Thus it requires a couple of feet behind the table if you're making these deep cuts.
The Jessem (from the picture) doesn't appear to have the any form of toothed-base registration. Without it, you may not have the repeatability. This may not matter, for your use. T
One of out members (TwoSkies57) has installed the Jessem Mast-R-Slide to his Incra fence setup and loves it. You might consider messaging him for more info or look in his gallery, as he shows the who setup, including its construction. The Mast-R-Slide looks like one heckuva setup and I may one day add it to my Incra also, as it appears to be a superior mitering slide to the one provided by Incra.
Please don't take my comments as anything negative against the Mast-R-Fence. I've no doubt its one mighty fine setup, depending upon how you plan to use it. For raised panel bits and remodeling, the Jessem may even be superior.
In any event, both are top-quality and I don't think you can go wrong with either choice.
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