I think that we are spoilt for choice at the moment with regard to bite alarms. If you can move past the 'historic' fox and Delkim debate some of the ranges out now offer amazing value when you consider the features they have. Those of which you will pay top money for from the likes of fox and Delkim. A quick look at offerings from the likes of new direction, prologic or even Nash tackle and you
Will no doubt be struck by what features they offer as standard for a set, yes a set, of remote alarms that cost no more than purchasing a single, similar specification alarm from the likes of the top two. It's worth bearing in mind that advances in technology means these items should reduce in cost. Although those more established manufactures are not going to reduce their sales margin, especially as they have worked hard to win that market place. If you look at the bite alarm market, it's there to see that all of the more competitive priced alarms are from newer companies or those established companies venturing into this market place. Those without a historic price point to maintain.
If I was to purchase now, I'd be looking past the volume, tone and sensitivity, as they are pretty much standard on most alarms now. If the remote option is available, why not have it. Options such as integral snag ears, night light facilities are useful additions and further onsideration would be to the type of battery it would require and there availability, tho again. As technology has improved, aa and pp3 style batteries are becoming the norm.
I have 6 Delkim txi plus and 4 fox ntxr. All great alarms. I doubt that I will ever pay that sum of money out again, not when similar featured alarms are now available.