In a way, yes I would, in a way no, I wouldn't.
The things that are clearly Annex A are listed as up to 1Mbps. Seeing as you are getting more than that, and IIRC Enta Annex A is up to 1.3 or 1.4Mbps, from various reseller sites in the past, I assume it is just Jason being (acceptably) cautious. No-one is going to complain about getting more than they signed up for.
It could just be the particular characteristics of your line. Given the extra upstream frequencies of Annex M, I'm sure you would get something pretty healthy, even if not the full 2.5.
Just in case you don't know, the way it works is that Annex M nicks some of the lowest downstream frequencies to use for upstream. On lines with a downstream sync of around 16Mbps on Annex A the loss of those can cause a downstream loss of up to 2.5Mbps. The nearer the Annex A downstream is to 24Mbps the less you lose, as there is sufficient spare "bin" capacity in the very high frequencies to make good the loss. I think
at not far above 20Mbps on Annex A the downstream loss by a move to Annex M is negligible.
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