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The Neo has been my go-to beacon for several years, after using all season last year the BT PRO is a nice upgrade! It has all the features you can ask for (plus some if you want), but still easy to operate interface with quick and clear directions for searching. The Neo is also in my opinion is the best "bang for the buck" in terms of features to cost. The other thing that sets this model apart is the ability to do updates and a full diagnostic with the app, other beacons can do updates, but the diagnost...

They are also Black, and this helmet holder is universal for the most part and will fit other brands packs if they have 4 anchor points.

Robert, depending on where you are located basically your options are 1- Refillable Blue canister, 2- Exchangeable grey canister, 3- Mail in with Arva or other dealer that can mail filled (hazmat). Technically a scuba or paintball place could do it with a special adapter, but most do not invest in this, keeping the process in specialty shops. www.canisterinfo.com has some more specific into as well.

Yes the Arva a little higher pressure and less moving parts, it is a trade off for smaller and lighter and possibly safer. Most info can be found at www.canisterinfo.com, more and more refill centers and exchange centers are being added every year.