Yeah I went with Red+IR mostly because most sites don't allow green/blue lasers (plus its cheaper I think). Honestly the perst 4 is way better than G&P dbal in many ways and you might as well save and pay double for perst 4 because it is very much worth the extra costs. Firstly the perst-4 actually allows eye safe power output (I believe it goes down to 0.7mw) which is plenty for the ranges in airsoft and so no risk of hurting someone. Secondly, it shows a red indicator light on the back when red laser is on but more importantly a blue light when IR is on which is important as so many times I see people with IR lasers on and they don't even realise (super dangerous as well). You can crank the power output to 20mW (while dbal is 5mW I believe). Also my DBAL dies just from a bit of rain and the connection port feels really flimsy and easy to break/bend. Also, the red laser is slaved to the IR and so you can zero both with just the red laser in daytime (not a feature with G&P dbal). Also theres a pressure button ontop and at the back of the perst-4 whereas Dbal has only one small button ontop. Also I found switching the settings on the DBAL in the dark to be difficult and hard to memorise as theres so many options, this is simplified with perst 4.
TLDR: for the love that is all holy, DBAL is like a paperweight compared to perst4, save your money and buy the latter.
Also, buy from ebay, the postage is cheaper and customs didn't hold mine hostage (came in 1.5 weeks).