I initially tested their 100-trial pack, and all the IPs provided were of elite quality. However, when I purchased the 1,000 US proxy pack, I noticed that around 60% of the IPs were at an anonymous level and were easily detectable. Some of them even appeared to be public proxies.
I wanted to share my experience, and I would advise against relying on the trial proxies as they seem to provide a selection of the best ones for testing. The actual quality of their proxy pool is considerably lower. However, it's essential to consider your specific use case because their prices are quite affordable, so some compromise may be necessary.
I'm a bit disappointed because the trial proxies were elite, but the IPs in the real pool didn't meet the same standard, which doesn't seem quite right.