There are differences in quality of fabric, shoulder design, and you want to make sure that actual Sling Rings are used (especially a concern with etsy seller and other homemade slings).
That said, I bought a no-name ring sling used, and love it. It's two layers of cotton, has nice pockets on the tail, and works well for me. You don't have to spend $80 on a ring sling. Sleeping Baby Productions is a well loved brand at a lower price point (start at $35 new).
I don't think that all 'anythings' are created equal. I've seen slings selling for $20 and for several hundred dollars. I made my own sling for maybe $10, all told. The fabrics can really influence the purchase price. An organic silk hand-dyed, double layered, two-toned sling is going to be far more expensive ($540 at Sakura Bloom) than a basic cotton, single layered, all-one-width sling ($35 at Maya Wrap). Does all that mean they will work any differently? Not really. Buy with the climate in mind, but basically they all have the same function.
I tried the Hava ? sling and hated it. It had padded rails and was very hard to adjust. I ended up returning it and getting a Sleeping Baby Productions ring sling and I love it. Huge difference!
Yes and no. As mentioned, brands like sleeping baby productions are both quality and affordable. There are however lots of "fly by night" makers out there that I wouldn't recommend because you have no way to know their quality - I'd look for a maker that is a BCIA member so you know they are following the new industry regulations. I'd also avoid any sling that's just made of quilters cotton - they are cute but not comfortable! Linen is a solid fabric choice that can usually be found cheaply. Some cotton weaves - like what Maya wrap uses - are also good. Buying used is another way to save.
Re: Are all ring slings created equal?
There are differences in quality of fabric, shoulder design, and you want to make sure that actual Sling Rings are used (especially a concern with etsy seller and other homemade slings).
That said, I bought a no-name ring sling used, and love it. It's two layers of cotton, has nice pockets on the tail, and works well for me. You don't have to spend $80 on a ring sling. Sleeping Baby Productions is a well loved brand at a lower price point (start at $35 new).
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