Complete newbie here

So, my apologies in advance if this has been asked before but...
How efficiënt are 'open' cages?
I have a CB6000 and a HT v5, both of which have a tube design. However, I'm thinking about buying a Cobra 3d because it looks way easier to maintain proper hygiene in due to it being open. This would mean i wouldn't have to unlock daily, so less effort for my (possible) KH gf as well as for me.
But now what i'm wondering is: isn't it very easy to orgasm whilst wearing one of these types of chastity cages, where you can just touch yourself between the bars and stimulate yourself if you like? Or is it way harder to do than it sounds?
I have 0% experience with these cages so bear with me if it's a stupid question

Thanks in advance!