It depends is a good answer based on your question. I never use gas checked bullets in my magnum revolvers, haven't yet had a need to. One point I want to make, because from your question I'm not sure you know this, you can't put gas checks on any old hard cast bullet. The bullet has to be a design that uses gas checks.
In 357 magnum you're not likely to be pushing 180gr bullets fast enough to require gas checked bullets as long as you pick bullets cast from a decent alloy.
Leadhead or
Penn Bullets would be good sources for reasonably priced hard cast bullets that don't require a gas check.