We bought some last spring - Lizzie & co seemed to be frightened of them...
haven't yet tried them on Weeble.

All four of the cats I had when I bought them sniffed them, looked a little
nonplussed, then walked away, leaving me to play with the bubbles by myself.
But that's their reaction to most of the toys I buy.
They are so spoiled.

Sherry

Nope, our cats ignored them too. I still have the bottle somewhere...

"Susan M" <smawdsley remove @shaw.ca> had some very interesting things
to say about Cat nip bubbles:

Felix didn't like them.

Actually, Imp and Mischief kinda like them.  

Of course they've probably never seen bubbles before, so they spend a
lot of time staring at them floating through the air.

If I aim just right, I can get the bubbles to land on them.  Mischief
will start to swipe at them.  Then she goes and tries to hide behind
something so she can stalk and then pounce on them  Unfortunately they
don't last long on the carpet.  Mischief will start wiggling her but
ready to pounce and the bubble will pop.  She'll then look at me,
"Hey, make them last longer!"

 Imp is a little slow on the uptake, but if one lands on his back and
pops, he whirls around as if saying, "Hey!  what was that?"  If too
many fall on him, he runs away thinking he's being attacked, but then
comes back.  And then when the bubbles pop on the carpet, he'll spend
a sec looking at the floor, wondering where they went.It takes a
while, but soon he starts to swipe at them too.

later,

Kristi

I haven't tried the catnip bubbles, but Mithu adores the regular kind. In
fact, for a while, bubbles were the only thing that would bring out his
sweet little high-pitched meow.
-Caroline S.

Dakota went daft for them first few times, then realised
that he couldn't actually catch them, so he got bored.