If you’re already using a specific geneology program, use their DNA test. I used My Heritage while I was using Ancestry for my family tree. I got called by a high pressure salesman to sign up for the My Heritage geneology program. (I had uploaded my gedcom to the My Heritage site.) I told him that I couldn’t afford two geneology sites. The guy was snotty and condescending. We figure we just wasted our money with My Heritage and will do the Ancestry DNA as soon as we can afford it.
Of the 23 pairs of chromosomes in the human genome, 22 are autosomes. Most direct-to-consumer DNA tests look primarily at your autosomal DNA to determine your geographic ancestry percentages. This DNA is a mix of inherited DNA segments – half from each parent. Because everyone inherits at least one X chromosome from their mother, DNA tests often include the X chromosome in autosomal testing, though the X chromosome is not an autosome.
So from that perspective, if DNA testing for fun and to find potential cousin matches is something you are considering, then wait for when they have a cheap special offer available. If you want a proper ethnic breakdown, either use the raw DNA file and upload it elsewhere or use one of the more accurate providers. Note they only do autosumnal DNA testing and NOT Y-DNA testing so you will need to use another service for that.
Another key customer type could be people like myself, hurtling through middle age, perhaps just starting to feel the cold bony hand of mortality clamp down on their shoulder. People, who, in the past, may not have exactly prioritised their health, who are starting to wonder what may be in store for them and who are in the (“Hypochondriacs R Us”) market for some hard-core insight and advice.

DNA tests give you an educated estimate of your ethnic makeup and help inform genealogical research by verifying existing family trees and informing future avenues of investigation. Additionally, there's a possibility you'll find living DNA matches - distant cousins and other relations - who could share their family history with you to build a bigger picture of your family tree.
EasyDNA specialises in paternity testing. Results provide 100% accuracy if the male tested is not the biological father of the child and a 99.99% probability if he is the biological. We also offer a wide range other tests including DNA Profiles, DNA Art, Twin Zygosity DNA Testing, Forensic DNA Testing, Genetic Predisposition Test and Ancestry DNA Testing. Our many relationship tests will help determine whether alleged relatives, such as siblings or grandparents and their grandchildren, are truly biologically related.
DNA Clinics will always advise an appointment for your DNA test. However, there are occasions and circumstances when our customers prefer to collect their own mouth swab samples for DNA testing. DNA Clinics self-collection DNA testing kits are available to order by telephone by calling 0800 988 7107 or on-line at www.homednapaternitytest.co.uk. DNA test kits ordered on-line are sent out for FREE. The payment for your chosen DNA test is payable when you return your samples to DNA Clinics.
In this case, I would recommend two options: 1. Ancestry.com – If you choose to take their DNA test, you can also take advantage of their family tree feature. Your DNA test results would be compared to other samples in the database. Combining this, with a manual lookup you can do, you might trace relatives on your father’s lineage. 2.LivingDNA – LivingDNA provides a separate unique analysis of the paternal lineage. This analysis will give you an in-depth picture of your father’s heritage. The only drawback is that LivingDNA database is relatively small (compared to ancestery.com and other big competitors). You can bridge that gap using GEDMatch service, by uploading your raw DNA data (acquired by LivingDNA). You can read more about GEDMatch here. Good luck and I hope you would find what you are looking for!
More controversially, some of these kits profess to tell you your biological (as opposed to actual age) by measuring the length of your telomeres (in basic terms, the caps at the end of each strand of DNA that protect chromosomes, like plastic tips at the end of shoelaces). Other tests, such as 23andMe, predict higher risks of developing serious conditions, such as multiple sclerosis, Alzheimer’s and Parkinson’s, including the test for BRCA1/BRCA2 (breast and ovarian cancer) that Angelina Jolie famously underwent, going on to have a preventative double mastectomy and surgery to remove her ovaries.