I answered a post on another forum about the TRX.
The TRX is not as loud as the GP. If you want it louder, you can take out the seal over the speaker hole but then water can enter at that point like it can with the GP. Whites is not claiming the TRX is waterproof, but I had my empty case under water for hours with no leak. So dry or loud take your choice.
The plastic case is not cheap. If you are worried you can put a cover on the tip like users of the GP. The case is made to be able to replaced by the user. One screw and the insides slide out with no worry about damaging the switch like on the GP. Nice to not have to send the TRX in for a case replacement.
The TRX is not as loud as the GP. If you want it louder, you can take out the seal over the speaker hole but then water can enter at that point like it can with the GP. Whites is not claiming the TRX is waterproof, but I had my empty case under water for hours with no leak. So dry or loud take your choice.
The plastic case is not cheap. If you are worried you can put a cover on the tip like users of the GP. The case is made to be able to replaced by the user. One screw and the insides slide out with no worry about damaging the switch like on the GP. Nice to not have to send the TRX in for a case replacement.