Bottlenecking: No

Nerd Talk:
1. USB 2.0 60Mbyte/s max, but real world probably 25-30MB/s.
2. 6X blu-ray burner will probably move 27MB/s.

Short Answer:
In my experience, most USB 2.0 implementations will max out at around 6x Blu-ray speed.
There is no Bottlenecking of this blu-ray burner at 6X over USB2.0.

External drives can be fun for the portability factor. However a nice Internal 12X Blu-ray might read the same disks at 8X and sustain a faster transfer of files, thus saving you time. Either way, don't worry about it.. ;)

It would be to your advantage to obtain a USB 3.0 external drive.

Well thank you for awnsers, but if USB2 speed is close to the BD read speed than it's good enough for me. External USB3 BD is hard to find and price is much higher.

The difference between a 12x and a 6x drive is roughly $20 to $35. USB 3.0 devices are not significantly more expensive than 2.0 devices. Functional bluray drives sit between $65 to $100.

The cheapest functional drive on Amazon is the Everpower Slim for %65. It is a BD-ROM drive. According to user reviews it plays movies perfectly fine, but was slightly buggy when it came to disc recognition.

LiteOn has an external USB 3.0 Blu Ray drive that should hit online retailers in April at a cost of $60 to $75.

I was going to debate with him on all of these issues Mordeux, but then I figured it out.
All he wanted to know is if the 6X external drive would run into bottlenecks reading disks over USB2.0.

Keep in mind, he said "the cheapest that can burn" and he probably meant to say "the cheapest that I can buy". I was ready to post all kinds of Internal 12X Burners on Amazon, but we don't know what his limitation are other than what he is telling us. Perhaps he has a gift card at a store or lives someplace outside of the USA or only likes Samsung burners, not sure I care to know really..lol

Most of the 12X Burners only have a BD-ROM Read Speed of 8X. For 8X read he would need internal and that he said costs extra money and perhaps that puts this upgrade out of his budget range. If he stuck with external he would need USB3.0 and we don't know if his motherboard has that interface or if he would need a USB3.0 add-on card ect.

Guess I'm at that age I figure they should know some of this stuff already from reading Google searches. The geek jargon flows from us strongly and that we are guilty of spoon feeding the helpless people of the internet so that they have the fastest and best price for hardware, it's a never ending task.

Well I live in Europe, in one of the smallest countrys in the world, so there is tax called VAT that increases price of everything by 21%. And since it's small country I don't have that wide choise of products.