I am not directly familiar with the Topfin 125g ensemble.
However, it looks IDENTICAL to the Aqueon 125g ensemble, also sold by PetSmart, to the point that I believe it is the exact same tank set being produced for both brands, and for PetSmart by yet another, third party.
I own a 125g Aqueon tank, stand and 3-piece glass cover that I bought used in 2019 for $250. The originally owner purchased it from PetSmart as a package two years before, or so he told me. Thus the tank/stand may be ~5 years old now.
My assessment- The tank and glass cover are great and I have absolutely no complaints or wish anything was better. The silicone in mine is not black, but I believe they now offer it with black silicone. The plastic frames (top and bottom) are black plastic, and seem very strong.
The stand, however, I don't trust, although I am currently using it, with modifications. It is veneered particle board, and as such, it has all the long term problems associated with particle "wood". It can eventually swell and become damaged, particularly if in humid environments, or if allowed to get wet. I reinforced it with 2x4's, and placed it upon a wooden frame (also 2x4s) so it does not sit on the floor. I believe this solved the problem, but sometimes I wish I had just made a new stand to begin with. But I have not seen any evidence of damage.
I do not own the LED light that comes with the ensemble at PetSmart, l but I have seen the lights at their stores. If they are just to illuminate a fish tank, they are good enough; if a planted tank is desired, particularly with plants other than low-light plants, then, I think their LED strip will disappoint.
I have seen the Aqueon ensemble at PetSmart as recently as 1 year ago for ~$500. Thus, the $649 current price is not too bad (I guess), but they do have yearly sales. I have never bought a new tank, always used.
I hope this helps. Good luck!
The tank in question below (left one) ....