I use gustavo on gravel. Quality is fine, have had no issues with them. I usually pay around $10 for 2. Have stocked up and should be good for quite a while. Have only had 2 punctures, they were both on the same day from the same piece of glass that embedded itself in the tire.
Bought 1 cyclami and it came with a faulty valve connection and wouldnt hold any air. Others may have had better luck than i have.