I bought an AlexLoop about four years ago for operating from hotel balconies or holiday homes but never did (most hotels and holiday homes have lousy HF take-offs).
For backpacking portable (e.g. SOTA) the AlexLoop in its supplied bag takes up more volume than an EFHW, (collapsed) 4m pole and guys/pegs, It takes just as long to assemble and disassemble. You can’t use an ATU with a mag loop and the AlexLoop needs very careful tweaking of its tuning capacitor to optimize it for a given frequency. Also, it’s highly directional so in a CW pile-up you would be jumping up every 30s to rotate it for those faint stations thereby missing half of your chasers. Frankly, I think it would be a pain in the neck for SOTA.
Wire antennas like half-wave dipoles are more efficiency – and more practical. As mag loops go, I’m sure the AlexLoop is a good one. I sold mine a few months ago in hardly-used mint condition.
The majority of summits I activate don’t have trees. I consider this a blessing. Trees (especially wet ones) adversely affect the take-off and – in my experience – are rarely in the right place and distance from my operating point to be useful as a support post for the antenna.
Until this year I always used a 60/40/30/20 or 20/10/6 inverted V, linked dipole on a 7m pole or one of several EFHWs. But recently, especially for cramped or crowded summits I’ve been very happy with a HF vertical – a Chameleon MPAS Lite – expensive [“but I’m worth it”] and heavier than wire ones but robust in adverse weather and with a smaller footprint.