I see the point about getting trim fast, buoyancy control and longer bottom times but I humbly disagree. It will take time to master buoyancy and if Gill is able to rent consistently, the suit shouldn't be a problem. I am, of course, basing this on my own experiences. Yours might be different. I was able to rent the same BC and wetsuit (at least the same size and style) for 2 years before I bought my own so learning buoyancy control was progessing when I was renting. Granted it improved with my own custom-made wetsuit.
However, when considering that the regs (and bc) are life-support, the user wants to know without a doubt that it's in top condition. Rental equipment tends to be run-of-the-mill stuff not high-performance stuff for obvious reasons and that's not to say that rental equipment is not safe. But it isn't necessarily inspected after each rent out. As I mentioned earlier, I had 2 different sets of rental regs on different occasions within 4 weeks of each other crap out at 80ft! Upon inspection, nothing was found to be wrong with them and the explanation I got was that the diaphragm probably got some grit wedged in it keeping it open for water to enter instead of air. Yeah, air! Kind of critical!! How did such dirt get in there? Maybe quite accidentally and maybe everyone who had used them before me took great care to not accidentally drag them through the dirt and rinsed them completely after using them but I don't know for sure. I know that my own regs are rinsed thoroughly after dives and regularly serviced.
So, what I would look at is: what parts of my equipment are necessary to keep me alive?
wetsuit - while keeping me warm and improving my buoyancy skills, not really that important if I can rent one that fits reasonably well
computer - while able to provide me with longer bottom times, assisting with ascents and providing value data it is not what keeps me alive underwater. Tables are available for the time-being.
regs- air - critical to life-support!
bc - also life-support equipment.
Admittedly, I bought a wetsuit first against advice from my fellow divers but after my rental regs failed, I coughed up the dough for regs in one flat second!!
Gill, your life is in your own hands. Make the decision that you feel is right for you and not what everyone says here as you will always get different opinions. Everyone has different experiences. But that's the nature of the beast. If we were all in agreement on everything, there wouldn't be anything to discuss, now would there?
Diverlady