I bought this at the same time as the doc johnson small black butt plug and will probably allways choose this one over it! Here are all the advantages I found for such a small price rise.
1) Wonderful look, symmetrical and silver
2) All in one construction, it's so durable I feel like it could last forever even if I were to use it every single day!
3) Wide taper before cut away means that so long as you use enough lube as to allow comfort (not over the top amounts) it will probably stay in easily. This is great if you want to insert it and leave it.
3.5) The teeny weeny tip makes insertion a dream.
4) It's made of silicone, the best material for butt plugs.
Although not a universal advantage, it's short height is benefficial for me as it provides the feeling of fullness without being overly evasive.