I’ve been feeding this feed for at least 6 months and have not had any issues with choke however my horses feed is already soaked and beet pulp shreds are added. I did note that the last few bags did seem to have large chunks of beet pulp then I have seen in past. So far, my 30 and 21 year old have not had issues but again the food is already soaked due to the aforementioned addition of beet pulp.
ProForce Senior is a good alternative if you are looking for another. I also love Tribute Kalm Ultra which has no addition of beet pulp. I was feeding my 30 year old Tribute Kalm Ultra solely up until 6 months ago when he really became unable to eat hay so needed a more complete feed.