They are quite big compared to the 40A floor standers. I loved the sound, one thing I didn’t like was they just sat on the frame and were difficult to move around. Also very heavy for a one person lift.
With large heavy speakers it would be better if they designed with some form of handholds, and if tgey provided a means of securely bolting to the stands - the latter would facilitate moving by tilting and “walking” them.
I have the same problem with my PMCs, awareness of which, and in recognition that I’m not getting any younger, originally made me opt for different speakers, but later reflecting on it I thought differently: It is only an issue when first positioning, or if ever later moving house, as otherwise they never need moving. When I unpacked and first installed I actually did myself though my wife would have helped, ditto my sons who were then still living with us but I wanted to do immediately not wait till next day! I simply couldn’t lift them, as there were no handholds and surface too smooth to get a grip, so I had to contrive a way to do. (happy to describe if wanted). I positioned where my previous speakers of similar character had been, and as I have been very happy with them I have simply left there.
I have had the Townshend Podiums on ATC 40 active and PMC 26i speakers. I now use Stack Audio Auva’s, which in my opinion and others, gives a superior sound quality upgrade, to the Podiums.
Oh, one more point, they look better than the Podiums. 
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I have just got the 50s replacing my 40s, they are lower and don’t seem bigger in the room they are a little deeper but all in all not bigger and the have handles on the back so not to bad to move but easier with 2 people. I intend getting stack isolation and they will be easy to slide to different positions on a wooden floor, just my thoughts 
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If they are not the tower version, then wouldn’t they be better on stands like the ones @Farthings-cat is currently trialing, to put the tweeters around ear level? I think that is the way they are intended to be used, likewise the larger non tower 100 and 150
Congratulations nice speakers, in comparison to the 40’s they are about an inch or so shorter, they seem wider as the 40’s width includes the metal outriggers, quite a bit deeper. The 50A’s weigh about 16kg more, I am used to floor standers so when I tried to walk them into position I got a surprise as the speaker and base are not attached.
Lovely speakers unfortunately just a bit too much for my room.
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Yes on the stands supplied by Atc intending putting stack isolation units with the pads on the stands rather than spikes to make positioning easy
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They are indeed lovely speakers and are certainly not a one man job if repositions on spikes
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Really pleased with them, lovely finish 40s were great but 50s much better bass just a delight to listen too, can’t wait to retire and get my system home. 
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