Gumpster

Absolutely incredible ona, but you need to rinse out the excess oil before using. Otherwise you'll not feel much and be very disappointed like I was upon first use. You'll also need to use only a small amount of lube as it is on the softer side.
This one fits me like a glove and strikes the perfect balance of stimulation and smoothness. The beggining of the tunnel feels like a nice hug going in and the back gives just enough stimulation to make you finish.
The nub in the back is an acquired taste that some may dislike, though I quite enjoy it. Squeezing the air out is not easy but once you do it keeps its suction.
The exterior is intricately detailed but strange to look at. The vagina is cute but the cheeks look absurd. They are more for the feeling of them hitting you while using the ona, which adds alot to the sensation, so I can forgive the appearance.
I've seen some comments on the durability. I've only had mine three weeks but I've used it literally every day since I got it and it's holding up for now. I'll update when it breaks.

I enjoyed this toy quite a bit, but got bored of it quick. I've used it a few times now and I'll probably wait a while before I use it again. The material is harder than I was expecting but not to the point it hurts. The main body of the tunnel is fun to go through and feels great, but I could never manage to finish with it due to it feeling unpleasant with quicker strokes. Im not long enough to make it to the back area of the toy so I can't really comment on it other than it makes generating suction very easy.

It's as thin as it can be without feeling watery and dries very slowly. Be careful, this stuff flows out quickly. It's my personal favorite and I'd recommend it for any toy, even high-stim ones. The only problem I have is with the bottle. Opening takes a bit of force and the sound of it is a fairly loud "pop."