It's a very short term use, but I would still like to give my review.
First thanks for AI sending samples to the UK. I got samples within a week.

I tried the blue capsules first, which is Perform, a libido/sex performance enhancer.
My taking schedule was a bit random, because I read the ingredients and find it is really a herbs supplement, so shouldn't be a big problem if I don't have a strict schedule on taking. Also, I am single and don't have regular sex.

I just finish my tongkat ali/ long jack 1:50 extract one week trail. Long Jack gave me morning wood which I havn't see for long and a bit acne, mental sexual desire seems to be the same in that week. I was off Long Jack for 2 days and then took just one capsule of Perform in the evening. The next day I got a even harder morning wood!

Day 2, still just one capsule, again hard morning wood. I think one Perform capsule only contain 300mg of 1:20 Long Jack extract, so maybe the combination of Maca, Tubu, horny goat weed all together work better.

Day 3, 2 caps, and in the evening 1 cap. I felt a slight increase of desire at that night, but just slight.

Day 4 morning just one cap, then I was busy all day. But on that day I have kind of a feeling that I am ready for sex anytime. While i didn't have, so at 2AM midnight of the day, I was tired but I felt maybe I should have a wank; because my organs gave me a feeling that if I don't do it, they will need to release the pressure in my sleeping anyway. So that's what I did.
Umm, it's a enjoyable one, intensity of orgasm was not too bad. Duration was not really longer. What I noticed was the feeling afterward. I am the kind of person who has 'depression after ejeculation', so I basically don't like masturbation. However this time I felt relax and I had good sleep.

Day 5, The best part is next morning. The morning wood was hard as before, not influenced by ejeculation 6 hours ago at all! I am think if I didn't fall asleep, maybe my 'reload' time would be shorter.

I didn't take any at day 5 and I didn't ejeculate either; but on day 6 morning I didn't have morning wood anymore. So I am pretty sure the morning wood on day 5 morning was from the cap I took not after day 4 morning.

All the experience above is not base on real sexual intercourse but still might be useful to post here. I will keep the rest of Perform samples to do another test if I would have chance to have sex in the near future.

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in brief:
Perform:

positive:
gave me hard morning wood in minimum dosage and in one day. I am sure if I have had sex my penis would be harder.
A good mixture of herbs compare to just use one of them.
May shorten 'recovery period'

may-be-positive:
bags seem to be slightly fuller thus sent single to my brain telling me to get sex. If I took 4 caps a day I might really feel it, but it would be a waste for a single guy just use this for masturbation.

neutral:
my real mental desire change little.
didn't last longer in masturbation, not sure in real sex.
semen volume seems the same (much ).

sides:
didn't really have any in such a low dose. might be a bit dry mouth but too slight to aware.

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It works strongly on at least one important way, which is nice. Taking more might have better effect but I can't comment on this for now.
I am happy to recommand this to guys who have sex partner (or pals).