Is it worth the price ? - Yes
Is it deep ? - No, but good head action
Do the 30 functions feel good ? - Double Yes, good mix for long and shorter sessions.
Solo or Partner ? - Both
Suction Cup Reliable ? - Depends on the surface that you use, depending on the vibration setting, keep a hand ready, sometimes it will cause the suction cup to lose suction.
Shower Reliable ? - So-so, make sure that the cap/suction cup is tight/sealed or water will seep into the battery compartment. Too much thrusting will cause the sleeve to allow water inside the case that houses the vibrator.