Been their customer for many years. Designed my own business cards and had them stored on my Vistaprint account for years without significant problems. They recently made changes to their website which messed up my business card layout and it was all lost. After attempting to redesign it I realised the interface is not as good as it used to be. I would still recommend their business card designer and printing. Just make sure to check them all after receiving as they tend to occasionally print low quality or misprint, but usually their business cards are quite fine.
Now regarding their other products, I would not recommend and here's why:
POSTCARDS - their postcards may be good as promotional cards, but not as view Post Cards for mailing, since the sizes are odd (too short) and do not match that of a typical Post Card or envelope and the paper quality is too thin and too low, while the print is also of a low quality and unattractive.
INK STAMPS - The rubber stamp shifts easily and you have to keep on readjusting it. The glue is too weak to hold the rubber pad in place. The ink supply of the rubber stamp wears off extremely fast and almost always a new rubber stamp only lasts for just about 25-100 impressions. All of them are like that. Their rubber stamps quickly lose impression quality as well and become extremely uneven. Absolutely not recommended. I would even say - Avoid.
STICKY RETURN ADDRESS LABELS - while it is convenient to design your own and they are quite of a larger size (I wish there were several sizes available, to fit on smaller envelopes as well) and the print is of a quite fine quality, but the GLUE is too weak and a lot of mail I received back had these labels semi-detached or even missing. Not recommended at all, because of the glue, unless you use extra glue and secure them with a tape!
I would only stick with Business cards and ignore the rest of their products, even the ones I did not test, as they may be of a low quality. The requests, cries and demands to increase quality of their products fell on deaf ears. Instead of that, they would rather offer and send you free extras rather than listen to your cries to improve quality of their products, so you could in turn order more from them in the long run.
One good thing is, if they screw up, they will most likely send you replacement of the product and extras, if you ask or demand it.
So unlike Bing.com, Twitter.com, Amazon.co.uk, Banknotes.com, Instagram.com etc. etc. That have great content VistaPrint.com is just average and is barely recommended.
Therefore I rate them 3 stars instead of 2. Although I would rate their rubber stamps at just 1 star or rather No star. Hmmm, wait, is there a Black Hole Rating (for rubber stamps)?