In yesterday's session Laura reminded me of another common effect. I do not use it, but she and Jordi use it all the time.
Mutyo Item effects to make the item smaller and/or totally different. Change a longsword into a knife, or a staff into a reed belt in order to make it more transportable/disguise-able.
Cheers,
Xavi
I am not sure travel magic (Leap of Homecoming) is a goos talisman spell, because you must use the lowest of your requisites for creating the effect (and there are plenty).
If you learn it as a normal spell, you can use it at once and learn rare requisites later (which is important for characters that do not start at 50pg).
Other thoughts : when the magus is locked up, he won't have his Talisman (unless he has a spell for calling it)-
A small indetectable Talisman ring (PeIm, PeVi) can be hidden, but where do you hide arc. connections?
Well, for something like a Leap effect, most magi would put the AC(s) in the talisman itself, so that's not an issue. Have one, have them all.
In many games there are effects called "linked triggers", and that term is not well defined in Ars, nor certainly very clearly restricted. It [i]seems/i intended to allow mental or similar triggering of an item. The Bjornaer effect would be one of the "similar" effects - or perhaps just a clever triggering gesture (not sure).
So why does Falke in GotF have the effect Perceive the change?
I don't much care if you have GotF memorized word for word, but for the rest of us, a page reference would be courteous.
Meanwhile (and after some digging) the answer to your query is... because this would be the former, and not the latter, of my two above suggestions, an effect that's "similar" to perceiving a mental command, it perceives something else.
Why do you even ask? 
I didn't memorize the page numbers - and do not have the book right now!Sorry!
It is in the character of the Bjornaer prima, a weak maga if I ever saw one. Her talisman goes along the same lines: I would assume he just got a talisman because she was requirted to have one or something, since as written, it is quite bad. It is the basic item, but lacks in any fancy effects that make talismans cool IMO. A WIP talisman, I would say. Really cool character if you want non-optimized stuff, but for me that does not deserve the role of Prima of the house, since her political skills are not on that level either IIRC. I like the idea of a non optimized primus, though 
And yes, the talisman detects when Falke changes shape in order to adapt itself to her. It is a silver ankle ring IIRC.
Xavi
p. 96
It is and it does. And it does very much appear to be a WIP - but then, she's only 49, 26 years out of her gauntlet.
Most suitable or most powerful, best or anything doesnt really matter. A leader can be a compromise, or a front for someone else or the least bad choice, her best friend might be a superb politician but not interested in taking the leadership themself etc etc etc...
Not described as such in the background text IIRC. I am talking with the feeling I got when I read the book when it was released, so my memory is fuzzy at best.
Consider me to have stockaded a Serf's Ward 
Xavi
Another effect might be handy: Maintaining the Demanding Spell at voice range. It'd work on any effect at up to the level of the MtDS -5. This way, if you cast a spell, you can 'tie it off,' so to speak, to your talisman.
A 'nuke the mundanes' effect if absolutely necessary.
Anything with a linked trigger that you'd want to have at sight range. "No, that wasn't me. Honest!" Many Imaginem and Mentem effects come to mind.
For curiosity, why are low-penetration effects considered a poor idea for your talisman? I'd imagine that the blanket +5 for working on your talisman and the similar effects bonuses would be very handy to eke out every last drop of penetration.
(Because after you improve the Te+Fo for that spell by +6, the total penetration from +5 for the talisman plus the previous values is outdated.
Or that would, I think, be the argument, anyway.)
I've never understood that myself. The activation parameters for Hermetic items are quite generous and open, and can be activated by such things as changing stance, or the wielder/wearer clapping his hands. The wearer changing form is about as physical an action as you can take. Even if you were to disallow that, I can see that changing form might even count as an environmetal effect because it is, frankly, of massive magical significance. Changing someone from Corpus to Animal isn't a minor thing. Finally, Perceive the Change is a targeted Intellego spell and constantly on - it'd warp the user phenomenally rapidly. Using it would require that the Talisman be unused most of the time, which is far from a desirable state of affairs.