To answer the original posters actual questions,
Yes, I have one in .22LR/.410 bore.
Yes, I like it very much.
No, it is not designed to be taken down but it is quite compact and lighter than the earlier wood stock versions.
I had to deepen the rear sight notch to regulate the .22 barrel, it shot extremely high as received.
The .410 barrel shoots to point of aim/point of impact when the front sight is aligned level with the top of the rear sight blade.
The gun is acceptably accurate to 30 yards with both .22 and .410 slugs and this is about the maximum effective range of this weapon.
It comes with swivel attachment points but no included swivels.
Get a nice lightweight set of swivels and a nylon sling and you can find places to put the gun out of the way without the need to take it apart.
The .410 barrel shoots most every ammunition well including the Personal Defense stuff made for the .410/.45 Colt revolvers.
The open bore is NOT an impediment, the gun still patterns kill shot well out to that magis
g 30 yards using 3" ammunition or the PDL stuff.
Steel case and Bimetal case .410 IS NOT recommended for these guns.
While the patterns and power are quite good the cases have an annoying tendency to stick in the chamber after firing to the point of requiring a steel cleaning rod to punch them back out.
As for the rude and ever present comments on the price of the gun,
I bought mine for $425, they have since come down in price and can be found for $380-$400
A new in the box earlier savage .22/.410 top lever gun will realize an easy $700 on todays collector market and most of the early used guns selling for $400+ have issues for what you are paying.
All in all, if you like the concept, these are decent well made, well designed guns for the money spent. HTH