Firstly to "imdennis" omg mate your a retard... I've heard of constructive criticisms but your taking it to the next level... These boards are here to help people not shoot them down and make them feel like crap, I suggest if you don't have anything nice to say then keep your mouth shut.
As for switching Labs, if the gear is good and from another reputable lab then it's all good. In fact I have been helping out a close friend source his gear and it's exactly the same situation. He's currently running Test enanthate at 500mg ew from ISIS labs but he only bought one vial and he's about to run out now I can still get him ISIS products but not test enanthate 250 so he's going to be switching on Monday to Med-tech test enanthate 300.
This isnt an ideal scenario but cos he didn't buy enough to start with its now unavoidable but it's totally fine as I can guarantee both products are equally as effective.
So to answer your question, not ideal but fine if your source is both trustworthy and reputable and even better if you know guys using both products and getting good results.
Best of luck on your cycle mate..!