Well, honestly it depends on the model.
They're very high quality. Really good texture. Silicone is awesome and their colours are vibrant. Suction cups are great, if you got that option.
Cumtubes are also really fucking great but you should practice a bit with them and keep them clean.
If you got something with ridges or rings, expect to have some sensation you've never felt. It's really fucking awesome, even if it can be challenging at times.
Recommended colours: neon, nothing spotted, glow in the dark (the brightest three), blue colourways
Recommended models: clayton, chance (flared or unflared), tentacle