Prami and Caber are the most recommended for a Tren cycle, at least in the circles that I run in. However, of the two Cabaser (which is actually intended for Parkinson's disease) is much weaker than Prami, but it works great for some people. Also, you need to be careful on the dosages as Prami has some sides of it's own:

For prolactin prevention: when you are taking something that can cause prolactin issues or when you just want to lower prolactin, for the benefits of lowering prolactin. 0.125 (1/8) to 0.5mg (1/2) per day should generally be sufficient for most users. With prevention slow escalation should not be an issue.

For Treatment: When you have ongoing prolactin issues, Gynecomastia flare, or are attempting to regress gynecomastia tissues (ductal, lobular and central gland mass). 0.375 up (3/8) to 1mg should generally be sufficient for most users. Most people will not need over 0.5mg. If you do, then SLOWLY escalate the dose. You still should start at 0.25mg and slowly work up.

Doses should be taken in the evening, 2-4 hours prior to bed. For the very low doses, an hour is probably fine. If it keeps you up, take it earlier. If it makes you sleepy "too soon" then take closer to bed. A good number of people will notice niether. Taking with last meal of the day may be ideal for a lot of people.

I have. I've gotten a number of different products from them (caber, aromasin, clomid, ephedrine, HCG) and they've all been right on. Easy guys to deal with. They'll ship the next day.