they have the aluminium P-204s and EP-204s for half the price of carbon fiber and only weight a slightly bit heavier. Out of those two, the P series is similar to the 424 I have while the EP is a newer lighter model white different base but I haven't tested it yet.
I prefer 500 head to 502 for monopod because of lighter weight. The 500PL is compatible with 501PL system but not the other way around. If you want, just switch the base plate to 500PL and you should be fine.
I would not recommend it at all, tested it in the shop and the thing is wobbly like hell. Those tiny feet just doesn't cut it