Just buy from Penonaudio. Or if you want, I can sell you my nearly unused Pistons 2.0 iF Edition.

The Pistons are bassy IEMs, borderline into basshead territory. There's also a surprising amount of sparkle up top and generally, the mids do suffer presenting the Pistons with a U-shaped signature. Soundstage is pretty wide though and generally the Pistons are laid-back IEMs. Great for pop, rap, EDM, techno sort of genres.

Pretty much. The similarly priced SoundMagic E10 is more balanced at this regard, it doesn't have as much prensence on the bass nor does it ever go lower than 50hz (rarely even touching that in fact).

You could do the foam mod by removing the foam in the Pistons to improve mids, but that really saps out the kick on the bass that the Pistons is known for. Double edged sword IMO.
Some people like it without the foam because it becomes less U-shaped and is generally more balanced and upfront, but I personally think it doesn't fix much. Also by removing the foam, the treble becomes way too bright as well.

Indeed, the looks of it is something you'd generally expect from IEMs priced RM300+ or more.

Yes, becareful of fakes. If you want no fuss, get it directly from PenonAudio.