I got a few of these just to satisfy my curiosity, and to waste ten bucks each and waste time sorting the transistors into piles of the same number.
My general observations
Most of the datasheets for these transistors can be found online.
Most of the transistors are PNP. I got several dozen, maybe a hundred of the 2N6726, which is a PNP high current 2 amp moderate gain BJT (bipolar junction transistor). This and its NPN complement might make a good headphone amplifier.
I got a few dozen of the MPSW92, a 300 volt, 1 watt BJT in a lengthened TO92 case. This might be good for a low power SMPS type converter / AC adapter. It’s not a general purpose transistor. Along with these I got a dozen or so MPSA92 transistors, which seem to be the same but in the standard TO92 package so they handle less power.
I got a few dozen MPSA63 PNP Darlington BJTs. I seldom use Darlington transistors, but if I need one I can connect two regular transistors to make one. Darlington transistors are not useful for low voltage circuits such as a Joule Thief.
I got a dozen or so PN2907 or PN2907A PNP general purpose BJTs. These are common and very useful, if you need a PNP. They are the complement to the ever popular PN2222.
I got a few dozen of the PN4124, which is a lower voltage version of the most popular 2N3904. Along with these I got just a few of the 2N4125, the lower voltage, lower gain version of the popular 2N3906 PNP BJT.
I got over a dozen of 2N5087 high gain, low noise PNP BJTs. Their maximum current is only 50 mA. They might be good for a microphone preamplifier.
I got quite a few 2N5222 BJTs. These low current, low power BJTs are for VHF Radio Frequency circuits up to 200 MHz.
The 2N5818 NPN BJTs in the assortment are NPN general purpose, and look like they might be good for a Joule Thief. But there were only a few of them.
I got a few BC368 BJTs. One box had 1 BC369, which is the PNP compliment of the BC368. Both would make a good choice for a Joule Thief – they can handle up to 1 amp current.
I got a few of 2SC1213 Hitachi transistors. These could be used for a Joule Thief, but they have the odd Japanese pinout, which puts the collector lead in the center. If you put this BJT into a PC board made for E B C, the collector has to cross over the other lead. This means an insulated sleeve has to be put on the collector lead to prevent it from contacting and shorting out to the other lead.
There were several other types of transistors but there were only one or a few in each package and not worth talking about. Many of the transistors came on tape, and were pulled off the tape by hand. This caused the leads to be bent, and could cause them to break later. the ones still on the tape showed that the tape was torn, meaning that they were handled roughly. The workers could have at least used scissors to cut the tape, a less stressful treatment of the transistors.
I would rate these Transistor giant bargain assortments as a very mediocre bargain, with the cost per transistor about the same as buying from a dealer. The selection was a limited assortment, both in quantity (few types, each of large quantity) and in polarity (mostly PNP). I would not have purchased or I would have purchased fewer if I had known the selection was this limited.
