I have a few sets of the AL-25 as the pricetag is extremly favourable. I have not invested time and effort into finetuning the set, but for my use, they are good enough "out of the box"
As jors say, the scan angle are not great. I have put them side by side to some PT-30, and to my eye there are not big difference using QuickShow/FB3 for graphics.
For beams, there are no noticable difference.
I have had the AL scanners for a 18 months, used a few hours every month. So far, so good, but i am in no position comparing quality ragarding lifespan to other scanners.
So as for "bang for the buck", AL scanners are a great deal.
What i don`t like, is the cables that comes with the AL scanners. Cheapo Cheapo, superfragile, and handle with care.
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More projects than time available.
More projects started than finished.
More money spent than earned.
More failure than success.
Just got to love lasers!