I just had a quick look for you and the one that p&k has bought is the one that LH recommend for beginners and is very hightly reviewed - hope this helps :) xx
I've tried quite a few extenders and the best by far is called tommy gunn cyberskin by topco I've checked out LH and they don't stock it .but it is good well better than 3 extra inches
I bought the one that p&k has ordered, had it quite a while and it certainly looks impressive, the OH has to be in the mood to let me use it as it is a quite firm toy, we found that the Lidl Extra Silicone Penis Extension Sleeve was a bit easier for her, has the same length but a lot less girth and the solid extension part is far softer. Hope this helps.
I can recommend the Adonis Textured 2 inch penis extender as supplied by LH @ £14.99.
It slips over your erect penis very much like a condom and provides some extra length and a bit more girth. It certainly does work. Road tested by the wife and I. I didn't think that I would be able to feel anything with it on but you can and do and I have actually cum inside it whilst making love to the wife so that was a bonus. It has nobbly bits on the outside for extra vaginal pleasure.
What's the worse that could happen? if you didn't enjoy it you can always return it.
I have http://www.lovehoney.co.uk/product.cfm?p=26872 ive had a couple before this and its by far the best, no chance of it coming off and is textured inside so feels great, ive often used it to masturbate. I measure just under 6 inches and with it on it looks rather large especiialy in girth and the OH was a bit apprehensive however it is very soft so squeezes easily. Highly recommended :)