Four cups in one bundle is way better value than buying them separately, and the Strong vs Extra Strong difference is actually noticeable once you compare them back to back. The vacuum seal on the Premium one feels tighter and holds up through the whole session.
Ruby★★★★★
The built-in vibrator on the one cup adds a whole different feel compared to the plain vacuum versions — way more intense than I expected. Getting four cups in one bundle means I can switch between the Strong and Extra Strong depending on the mood, which is honestly the best part.
Ruby★★★★★
The vacuum suction on the Extra Strong cup is way more intense than I expected, and the adjustable air valve lets me dial it back when I want something gentler. Having the vibrating cup in the same bundle was a nice bonus for mixing things up.