I've dealt with them in the past. Bought guns and ammo both. Prices were fair, products were in good or better shape than advertised.
I have a P1, and it is a fine gun. I think you'd do better, though, with Wideners, in this case.
It costs ten bucks more, but it comes with two magazines and Aim only has one. That's worth the ten bucks, right there. But then there's the matter of the pin.
The original P38 had a steel frame. Took the pounding fine. Post-war P1s, however, have an aluminum frame. Pounding started to cause problems. The solution was the installation of a steel recoil block, commonly referred to as "the pin".
Notice this Widener's says it has the pin, and the pic has an arrow pointing to the pin.
Then we have these, with no pin. See the arrow showing there is no pin?
That is more for people that are looking to fill out their collection. They have them with the pin and without the pin and with slide serrations both in front and behind the safety, and with the serrations just behind the safety. All different variations that collectors might want. But they tell you EXACTLY WHICH ONE you are getting.
Aim don't. The gun in the picture has the pin. That is no guarantee that the gun you get will have the pin. Maybe all their guns are pinned. Maybe it's a mixed batch and they don't differentiate. You won't know until your gun gets here.
So, like I said, in this case, I'd go with Widener's.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.