OE2X:I am a Ranger owner.
The reason why I don't like the Ranger is because it is an inferior BCD to others that I own.
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So I just want to say that I do have experience with the Ranger and can't extoll it's underwater virtues because other than being well made and floats you on the surface it really doesn't have any.
I am sorry you feel this way about your Ranger. I have been diving a Ranger since 1994 and feel this is one - if not the best BCD ever designed and manufactured. Now let's see, I also dive a Transpac/Trek wing for single tanks, SP nighthawk, SP S Tek Harness w/ DiveRite Trek wing and I have a few Posideon (Eccolift) and Seacsub BCD's in my rental gear that I have tested out. With all these BCD's I never felt like turtling.
Twice in my diving career I did feel like turtling. The first time was when I first started diving, always wanted to go down tank first, then with some experience I found my balance (kinda like riding a bike) and since don't have that problem. I do see this problem with many many other new divers, but I also see them correct this problem with experience.
The second time I felt like a turtle was well into my dive career. I started diving doubles and wow, talk about top heavy. I was head down, then face up, then feet dragging - everything but horizontal and feet up. But with a few hours practice in the pool and a bunch of open water practice dives I can successfully dive without turtling. Some days I will use double al 80's, or LP steel 80's or steel 98's or steel E8-130's and with different size wings. They all dive different but I have learn't that whatever I am diving whether a BP/Wing or a BCD with a few adjustments to my body positioning I can control my trim.
For the last couple of years I am usually in the water 6 days a week doing at least 2 dives a day, gaining experience and having a great time. Most scuba units are top heavy - thats where the tank is. Though some BCD designs position you in the water in a manner that will make it very hard to maintain good trim, it's not just the BCD. Good trim comes with manipulating your body form, adjusting weight positioning and experience, now combined with a well balanced BCD you will minimize the effort you need to maintain good trim. The one thing that seems to be constant with easily maintaining trim is the use of a back inflate (wing style) BCD such as the Ranger. However there are many different body types and many types of BCD's. Try before you buy.
Edit to add:
My Ranger has over 600 dives on it and other than the neon green panels fading a little bit, the BCD is in excellent shape. Yah Yah, It was my first scuba related purchase - I wanted everthing to have neon green on it. Live and learn, now I would go to black on black.