Hi jones0169 and welcome!
Your machine (I have the same one you mention in your siggy) can display the overnight average pressure, AHI and leak right on the display screen. If you can't see these numbers then ask your provider to unhide them for you (they are hidden by default).
This is quite often enough information, you can check if your mask is leak is excessive and/or if your AHI is in the normal range (<5 is typical for adults).
Do your doctors (military?) have a card reader and software to download the smartcard for you? If they do and you are handy to them, ask them to download the card every 7 sessions for a few weeks or months. The card only carries the most recent 7 sessions, plus summary information for longer periods. (When a new session is added, the old one is dropped so it is always the most current 7 sessions.)
If your doctors do not have the card reader and software and/or you're not handy to them (can you mail them the cards? They can give you spares) then you might consider the purchase. But first, I would suggest you look at the display each morning and see if your AHI is acceptable and your leak is not excessive. If you are not having any problems with either of these numbers then the dump of the card will interesting but that's about all -- the details show hour-by-hour statistics of your pressure changes, AHI and leak.
You didn't mention your current pressure range. If your min/max pressure is more than a 4-5 point spread, the details from the card can be very helpful in fine tuning your therapy to a single pressure or a very small min/max range. There are exceptions, but for many people a larger range will not provide effective therapy. Some doctors start people out with the auto 'wide open' - 4 cmH2O thru 20 cmH2O - and then begin narrowing the range based on the 'numbers' either on the averages or from the detail dump.
So it really depends on how effective the therapy is going for you, as to whether the investment would be useful to you. If you are waking up during the night or in the morning and your mask is really leaking, this would likely cause a high AHI on the display. You don't need software to tell you to get your mask seal under control

If you're not waking up a lot (with leaks or other reasons) and your overnight average leak and AHI are doing well, the card details are probably of little benefit to you.
Hope that helps. Blessings,
--pseudonym