You can't beat the value for a full set of dumbbells than an old set of cast iron hex heads. They're not super accurate so I would love to upgrade eventually, but these definitely do the job.
We love our C2 machines! They're super effective and easy to move around, don't require a subscription, easy and cheap to repair, and customer service from C2 is great. You can't go wrong. The warranty is transferable also so don't be afraid to get a used one.
We have cast iron hex dumbbells up to 75 and use the ironmasters as the heavy set. They're a bit tedious to adjust but they're rock solid and probably some of the least bulky heavy adjustable dumbbells. Very versatile too if you consider the rest of the ironmaster accessories and machines.
I love my dock! I use for an SSB and a warmup bar. I see now that darko sells a double dock which I would probably get instead of this one if I was buying one today.