Speakers to hang on to for LIFE

I would nominate two - the bookshelf ProAc Response 1 SC and the floorstanding Tannoy D-700. After almost 20 years with both, I still find them thoroughly enjoyable.

I just upgraded the stat panels on my Innnersound Eros Mk II's to Roger Sanders new stat panels.

Broken in for past month and they are the most revealing, dynamic, resolving and uncolored speaker I have ever not heard.

I am super happy with a pair of Green Mountain Audio speakers. Not planning to sell them anytime soon - definitely a candidate "for life". Very realistic and dynamic. An absolute pleasure to listen to for hours and hours and days and days.... and years and years.
The model I own are the EOS HD with integrated speaker cables (very rare). They are currently being "upgraded" to HX. It is wonderful to communicate directly with the designer and manufacturer and know you can trust.
They really had to twist my arm to disconnect my speakers and ship them for the upgrade. I do not want to live without them for the weeks it takes to upgrade them and I can't imagine that the upgrade will be of any significance. But I trust GMA and was ensured that there will be a significant improvement. Looking forward to it! A keeper.
I am using the speakers in my "listening room", which is ~11'x17'. But they would also work well in bigger rooms.
For large rooms (>20'x20' with very high or open ceiling), there are other GMA models that I am sure would work very well. I have no listening experience with GMA floor standers.
After listening to many many speakers (large and small, more and less expensive) over the last 25 years, I have come to especially appreciate good monitors on stands. The imaging of good monitors - always making sure to match with room size and acoustics - is generally better and more accurate and dynamic and live-like vs "floor standers".
I also have a larger family room with floor standers (Waveform Mach 17), which are also keepers and I have been very happy with them for years and years.

For me with no questions asked it is Apogee speakers (and always will be)! It was my dream to own them once I had heard them back some years ago and I had at the time a georgous pair of Infinity Kappa 8s. I made a deal and have a set of Apogee Slant 6s that have been with me ever since. I've changed the front end electronics a number of times and cables but the Apogees have always been the focal point of a system that continues to grow and refine and thier performance has never disappointed me even as I've adutioned other speakers.

Apogee Centaur Majors in mahogany for me as well. Owned the same pair for approx 16 years and while I have enjoyed others, I always come back to them. I have owned a pair of Centaurs before that and also played around with the Mini Grands.