Nothing is perfect, but this works better than most
926570
Nothing is perfect, but this works better than most. I like how the sponge is wide and didn't crumble after using it. TY!
1338757
Works better than any other brands I've tried.
2657174
Not perfect, but it works better than anything else I have tried.  I was prepared for red juice splatter everywhere but not a drop leaked.  Still had to pick out a little pith - floating it out worked well.
2847385
Some tools just work and this is one of them. This does what it is designed to do and does it perfectly, which is not something you can say about many tools or gadgets. I've had it for several months and it works, every time, turning a chore into a minor inconvenience, but worth it for fresh pineapple with minimal mess and done quickly.
3017247
This thing was the answer to my problems, and it works better than I expected.
4367258
It's just about correct for any application. Yes there are a few small adjustments that could be made, but it's not broke so don't fix it.
4289452
Not sure why it works as well as it does but it does.
4839088
Works better than I expected it to, and easy to get used to.
3516479
worked perfectly, not the best fit, but did a good job
4697371
This thing is nearly perfect, but for the price, I'm very happy.  I try not to go too crazy on single-purpose tools (who has the money and the space for all that?), but this is one thing I'm glad I bought.  It got into a relatively tight spot, and popped the hanger off the pin pretty easily.  Would have taken me way longer and more effort without it, especially given the reduced clearances.

Two reasons I said "nearly perfect".  First, for additional leverage, a slightly longer handle would have been nice.  I have very large hands and am stronger than average, and even still, there were times I needed to get both hands on this thing to get the torque I needed (petroleum jelly on the parts you're trying to separate helps, btw).  Second, I haven't permanently bent the tool yet, but I suspect I eventually will.  It's reasonably well made, but the handles, which take the leverage, are stamped steel, and I can feel when I'm really squeezing down on this thing with both hands that it's starting to "give" a little.

All in all, I don't expect to use this often, but when I do, I'll be glad I have it, just like I was last night for its first use.  I'm sure if I was a professional, I'd have a tool costing five times this and better made, but I find this is pretty decent overall.
255649
Doesn't fit exactly right, but good enough for it to work
2192399
Worked well, not as good as some competitors, but is a solid product
2256350
It works as advertised and as well as it should
2999039
Sometimes you have to mes with it for a minute, but it works perfect.
1917104
As long as you mix the texture right, this thing works great.
4020583
Works!  Not super fancy or big, but it works.
4799534
This Delta machine is solid, with a base that is big and heavy.  For that reason alone, I believe it likely works better than most others.

Operation is an on/off button, an arm lever, a depth stop, an adjustable edge fence, and a workpiece up stop.  The fence works fine, with two handles for locking the fence.  Those handles are almost the only plastic on the machine, and could be one item for improvement.  But the fence works great and is solid.

The depth stop works fine, but could be improved with a more machined mechanism.  Though it works fine, it seems to stop with a little bit of play, but a play that is consistent such that the average depth over a series of adjacent cuts is uniform and entirely proper.

I find that the workpiece up stop is the weakest element, wigling a bit, but not really affecting the function.  I also find that the up stop is not so vital, in that the drill bit/chisel is able to be raised from a cut without pulling on the piece.  I have been using cherry though (I built an entire cherry bed having four posts with many mortises), and harder oak may be different.  I doubt it would be so different, and other machines could have a better up stop, but fail in more important ways, like being generally lighter and having less smooth operation.

The operation is smooth, just push a right-handed arm lever down to the set depth, then pull the lever back up above the workpiece, move the workpiece a bit to the side and repeat through the full length of the mortise, then flip the workpiece, and do the last pass to clear the other side of the mortise.

The cut is superb on the corners, where precision may matter most.  The line of adjacent cuts is precise and uniform too.

The lever mechanism is aided with a hydrolic, so it helps the bit move up, out from a full depth of cut.  The arm action is smooth and nice.  This reason alone is why I like this machine.

I haven't had problems with jamming in the bit, except on first cuts to begin the mortise, when no open cut exists to build from.  On those first cuts, just lower slowly and fully, and pull up, turn the machine off, then clear the chisel with a knife.  Then the rest is no fuss.  The clearing issue for a first cut mabye takes 30 seconds to a minute.  First cuts are the only thing, and the issue is minor if you consider the time saved from doing the mortises without a mortiser.

I find that the chisel apparatus squeaks too much, from the internal spinning of the bit housed by the square chisel.  But that is not a function problem, the noise is not bad at all, and maybe if I experiment with lubricants, that will go away - I'm almost sure.

I would rate this an 8 out of 10, and I bet almost all competitors in the price range would get lower.

Good luck.