Long John – realistic vibrator

Well... rubber is a material that will not last forever. It can be stinky (especially if you are sensitive to smells), and should not be shared or switched as both a vaginal and anal toy. Condoms are a good idea.
If none of that bothers you, it is pretty affordable. If you are looking for something with better specs... I'd say go for silicone. More expensive, yes, but they last a lifetime.