I own three of these but in the 30rnd capacity. They were definitely cheaper than these 20rnd capacity mags although if someone told me Cammenga will not be making any more of these mags then I would buy these for $39.99...even in the 20 round capacity. They are definitely worth it. You can load a 30 round capacity in less than 30 seconds. No strippers or easy loaders needed. These mags are at the top of my list of mags that I own. i own Tapco, Pmag, Mil Spec, NHG\Roland, and these. Below is the text of my receipt for them. I keep all my receipts.

Thank you for your recent order. We appreciate your shopping at Cabelas.com and hope that you had an enjoyable shopping experience. You will receive another e-mail at the time your order ships.
Products Ordered
3 of 23-1326 CAMMENGA AR-15 MAG 30 ROUND @ $29.99 each
In stock-Approx delivery Tue 1/15
Total
Merchandise = $89.97
Postage = $5.00
Tax = $7.36
ORDER TOTAL = $102.33
Payment Types To Be Used On This Order

CLUB Points = $20.00
Credit Card -- Cabela CLASSIC XXXX = $82.33
These amounts reflect the charges and payment type(s) for the order as it was originally placed. Items may arrive in more than one shipment and charges may show as multiple transactions on your credit card statement.

This is their retail price. Good luck finding other mags instock and actually being sold at their normal price. This has an easy load feature the front slides down pulling the follower down with it allowing you to load it quickly.

You found negative reviews of a gun item on the internet? That's amazing. I've never seen that before. These are priced the same as when they first came out. They're made of steel and seem much sturdier than standard aluminum magazines which are originally designed to be disposable.